Cheap Petrol & Diesel

Cut prices & improve fuel efficiency

cheap petrol & diesel

Petrol prices have begun to rise again over the last couple of months after dropping from a four-year high in October 2018. RAC figures show that motorists are having to shell out an average of over 10p/litre more than they were in February, yet if you buy in the right place, and drive in the right way, it's possible to slash costs...

In this guide

MSE Challenge: The petrol diet!

Once you've read the steps below, why not try the petrol diet? No, we don't advocate swigging the stuff – it's a challenge on the MSE Forum, where MoneySavers share tips to help cut their annual fuel spend, track savings, and inspire others.

The forum's proved hugely powerful in the past, seeing people work together to get debt-free, pay off mortgages and more. It's free to join, and open to all – see the Petrol/Diesel Diet discussion.

Step 1: Make your car more fuel-efficient

Some simple checks and adjustments to your vehicle can help reduce fuel consumption. (Thanks to the RAC for its input in compiling this list). Combined with the tips below on driving more efficiently, these could help save up to 30% on fuel costs - and of course, they're a quick, painless way to make a small impact on the environment too. 

  1. Keep your tyres inflated

    Lower tyre pressure increases the drag on a car, meaning you need more fuel, so regularly check the pressures are correct (over-inflating your tyres will also use more fuel) and your car needs less oomph to keep it moving.

  2. Declutter your car

    The lighter your car is, the less effort it needs to accelerate. By decluttering, clearing out junk from the boot, and not carrying unnecessary weight, you can save a little more. Any extra weight you ride around with ups your fuel consumption - while lightening the load won't make the biggest difference, it will help keep it down.

  3. Take your roof rack off

    A roof rack, even unused, adds wind resistance to a car, increasing drag and making the engine work harder. If you don't need it, take it off, along with anything else inefficient. Even closing the windows and removing any flags will make the car run slightly more efficiently.

  4. Turn off air-con at lower speeds

    Air-conditioning uses engine power and therefore fuel – so make sure it's turned off unless you really need it.

    The general consensus is it's more efficient to drive with the windows down and the air-con off at lower speeds, but at higher speeds it's better to use the air-con and keep windows up due to the extra drag caused by having windows down.

    If you're not using your air-con, it's worth turning it on once in a while as not using it can mean it stops working. Also, don't leave the engine idling. Drive off as soon as you start up and switch off as soon as you reach your destination. Turn your engine off where possible, eg, in traffic or during big delays on motorways.

  5. Don't fill it up

    Fuel is heavy, so by filling the car up you're adding quite a weight. The less fuel your car has in it, the more efficiently it drives. If you fill up slightly more often and put less in (to 1/2 or 3/4 full), it'll make the car run more efficiently.

    But don't be tempted to run the fuel too low – winter driving uses more fuel, so you'll cover fewer miles per litre.

  6. Save cruise control for motorways

    On long, flat roads, cruise control helps you save on fuel by maintaining a constant speed, thus removing unnecessary acceleration. But used regularly on roads that aren't flat, it will increase how much fuel you use because it's slower to react to changes in gradient, meaning it will accelerate for longer than a driver would when going up a hill. So reserve it for motorways where you can cruise along. 

Step 2: Seven tips to drive more efficiently

You can drive the same distance in the same car, without slowing down, but using far less fuel - better for your wallet, and better for the environment too. The key is to drive smoothly. Here are the seven tips you need to know.

1. The accelerator is a money pump – accelerate gradually without over-revving.  Speed up smoothly. If you press harder on the pedal, more fuel will flow – but you can reach the same speed using much less power. As a rough rule, stay under 3,000 revs. Plus, if you think about it, if you accelerate too quickly, chances are you'll then have to brake hard, which isn't exactly efficient.

2. Change up a gear sooner. Always drive in the highest gear possible without labouring the engine. So change up much earlier than feels natural – it will take some pace out of your acceleration, but as that's our first tip it isn't a bad thing. If you have a fuel efficiency display, you'll be surprised how immediate an impact this has.

3. Think about road position. All the other tips require you to be alert and aware of your road position. This helps you plan ahead and move gradually. It also means that more efficient driving is also safer driving.

4. The brake is a money burner. Where safe, allow yourself to slow naturally rather than hitting the brakes. When you press the brake you are effectively converting the energy you've paid to put into the car into heat. Instead, where you can, make the most of the car's momentum - good road positioning is crucial for this. Over the course of a journey if you brake frequently, you'll find you end up having to accelerate more too, which ultimately means using more fuel. 

5. Listen to the noise of your engine. If you hear sharp acceleration and the screech of the brakes you know you're doing it wrong. Imagine driving from traffic light to traffic light doing that. The person behind who speeds up and slows down more slowly will still be behind you at the next light, they'll just have spent far less getting there.

6. Keep moving if you can. The most expensive metre you drive is always the first one when you start. It takes huge energy to get a car going. So if you can roll gradually up to a traffic light as it changes from red to green, without stopping, it is more efficient than stopping and restarting. 

7. Coasting in neutral may feel cheaper but it's dangerous. While putting the car into neutral and coasting may feel like you're using less fuel, it's dangerous, don't do it. You always need access to the accelerator to avoid unexpected hazards. Plus cars can handle far worse on sharp corners when in neutral.

In many ways, this all comes down to one little rule of thumb.

Every time you put your foot on the accelerator, remember the harder you press, the more fuel you spend.

Just being conscious of this, and your road position, should massively increase how far you can drive on a tank of petrol.

While it's tricky to accurately gauge exactly how much you could save on fuel by making your car more fuel-efficient and driving more efficiently, the AA says when 50 of its staff undertook an eco-driving trial they saved an average of 10% in a week, and the biggest saving was a whopping 33%.

The real world impact: Martin's story

On an overseas holiday I got to test this, thanks to a sexy little digital display in my hire car which gave me a km/litre readout. For every trip, I drove normally on the way there and used the 'think when pressing the pedal' method above on the way back.

If you're thinking 'did he really bother while on holiday?' – yes I did, and I loved it. Luckily my girlfriend (now my wife) is very understanding!

The improvement is enormous!

Overall, I drove about 500 miles, and the different 'efficiency' averages per litre of petrol were incredible: for normal driving, it was 11.2 km per litre, but for efficiency-conscious driving, a remarkable 13.4 km per litre.

Most intriguingly, the efficient driving didn't cost me any time at all, and on motorways my top speed didn't change. Others drove harder, only to brake harder at the next traffic light...

- Martin Lewis, MSE founder & chair

For more info on this read Martin's Petrol Efficiency Experiment blog. If you try this type of driving or want to share your experiences, go to the Driving Efficiently forum discussion.

Step 3: Find the cheapest petrol or diesel prices

The easiest way to find the cheapest forecourt in your area for petrol, diesel, super unleaded or premium diesel is by comparing prices using a nifty free tool.

Go to website and after registering, enter your postcode and tell it how far you're willing to travel (up to 20 miles). It'll list the cheapest petrol stations in your area (it says the most up to date figures are displayed, which in practice seems to mean results are between one and four days old) and covers most of the 8,500ish forecourts across the UK. 

A quick check before you need to fill up could save you some decent cash. For a Southampton postcode, the price of unleaded within a five-mile radius on 21 May ranged from 128.9p/litre to a pricey 154.9p/litre. And while the difference per litre may be pennies, in terms of percentage that's an increase of 26%.

How does the cost of fuel break down?

Tax makes up a hefty portion a litre's cost. The current fuel duty rate for petrol and diesel is set at 57.95p/L, and you pay 21.6p/L VAT on petrol, and 22.5p/L on diesel.

Sainsbury's petrol station.

It's back. Sainsbury's 10p/litre off fuel with £60 spend

Between Thursday 23 May and Tuesday 28 May, spend £60 or more on groceries in one transaction at larger Sainsbury's stores and you'll get a voucher for 10p/litre off petrol or diesel to use at a Sainsbury's forecourt.

You'll also get a voucher if you have an online grocery order worth £60 or more delivered over the same period.

If you're going to spend £60 or more with Sainsbury's anyway it may be worth taking advantage of this deal. Remember though that even after the discount, Sainsbury's may not be your cheapest local forecourt – use to check.

You'll get your voucher at the checkout in store or when you receive your shopping delivery. It will be valid for 14 days from date of issue and can be used on one purchase of petrol, diesel or LPG only (up to a 100-litre maximum) for one vehicle. You can't use more than one voucher per transaction per vehicle.

Sainsbury's says you'll get one voucher per qualifying transaction and, as usual, Nectar card-holders will be able to collect one point per litre.

Anything to watch out for?

You can't get the deal when shopping in Sainsbury's Central or Sainsbury's Local stores. And not all spending is included – here's what's excluded:

Delivery charges, spirits and liqueurs, fuel, first-stage baby milk products, National Lottery products, tobacco, gift vouchers and cards, prescription and over-the-counter medicines, postage stamps, saving stamps, mobile phone vouchers, travel money, phone cards, e-top-ups, PayPoint payments, charity products, carrier bags and car park tickets. Plus spending at Sainsbury's cafés.

You can only redeem vouchers at Sainsbury's-branded forecourts. They're not valid for 'pay at the pump' transactions or at 'pay at the pump'-only stations, which are Dartmouth, Ely, Faversham, Hawick, Hazel Grove, Livingston, Sudbury and Whitehouse Farm.

If you spend £60 or more in a supermarket in Northern Ireland and have separate receipts from alcohol and grocery checkouts, and your purchases were made no more than 45 minutes apart, you can show both receipts to a Sainsbury's staff member to get a voucher.

Use loyalty schemes

Buying petrol is a regular outlay, and you spend more on it in a year than you think – £30 a week is over £1,500 a year. As many petrol stations (including the supermarket ones) run some form of loyalty scheme, it's worth signing up to schemes for the forecourts you'll use most regularly to get a little bit extra back.

However, never choose a petrol station just for its loyalty scheme, as the difference is small compared to petrol price variance (also see the Loyalty Points Boosting guide)

Other filling-up tips

There are several other ways to cut the cost of petrol and diesel:

  1. Always fill up at least 50 miles before your tank's dry

    Then there's no panic and you've enough time to get to a cheaper petrol station. Leave it longer and you'll fill up at the next one you see, so you won't be focused on price.

    This is slightly offset by the fact that a lighter car uses less fuel. But with 50 miles of fuel left, the difference is tiny.

  2. Only use 'better fuel' if your car can cope

    Many petrol stations sell 'high performance' fuels, yet there's little or no performance difference for most non-performance cars. So only fill up with the super-fuels if you've a sports car or you've been specifically advised your car will actually use the petrol correctly.

    The AA tells us that for most other cars, high performance fuels are too pricey for regular use. But if you're keen, it suggests using a high performance fuel every third or fourth tank full to keep the engine clean and efficient, then revert to normal fuel.

  3. Fill up at night?

    Talk of filling up at night getting you more is a slight urban myth, as the differences are minuscule – pennies at best. Petrol pumps are calibrated by volume, so fill up at night when it's cold and you get a tiny, tiny extra bit.

  4. Don't try to put more in after the clunk

    Filling up your tank to the top isn't great as it adds weight to the car (see how to make your car more fuel-efficient). But if you must, don't keep going after the petrol nozzle 'clunks'. If you do, you're overfilling.

Step 4: Pay using a cashback credit card

Cashback credit cards pay you back each time you spend on the card.

They are a great way to shave down the cost of fuel, but ALWAYS abide by...

Set up a direct debit to repay the card in full each month, so you never pay interest, which would outstrip any gain.

The reason card companies offer cashback or reward schemes is simple. They want to encourage you to spend on the card and pay them interest. The interest cost of all cashback cards dwarves the cashback you'll earn. For full details on things to consider before applying, see Cashback Credit Cards.

Each time you apply for one of these cards, you'll be credit-checked by the lenders. Multiple applications in a short period can impact your future ability to get credit. Read full details in the Credit Scores guide.

The easy way to pay off in full

It's easy to do this via direct debit, which allows the card company to take a variable monthly amount that corresponds with what you owe it. Sadly, some providers deliberately omit the 'pay off in full' option from direct debit forms, as it makes them less money. If that's the case, write 'pay off in full' on the form. They should honour it, but call up after a week or so to check they have.

The top cashback card

Here's our top pick currently, but also see other options in the Cashback Credit Cards guide.

Good for all-round spending: 5% intro cashback + up to 1% after

The American Express Platinum Cashback Everyday* is not specifically a petrol cashback card but as all spending's included, it's worth checking out if you fill up often. You get a massive 5% introductory cashback, then it's tiered up to 1%.

Need to knows
  • You earn 5% for first three months (max £100, so £2,000 spend), then 0.5% cashback on up to £5,000/year & 1% above this.
  • You must spend at least £3,000 on the card in a year or you will get NO cashback.
  • Make sure you repay IN FULL each month, or you'll pay interest at 22.9%.
Cashback: 3mths 5% (max £100), up to 1% after
Max cashback/year: N/A
Paid out: Month after card anniversary date
Annual fee: None
Min income: N/A
Min spend: £3,000/yr to qualify for cashback
Card issuer: Amex
Rate: 22.9% representative APR (see the Official APR Example)

See how likely it is you'll get this card

MSE's Eligibility Calculator

Go straight to the lender


Step 5: Share the driving to cut your petrol costs

An easy way to cut petrol costs is to drive less! One option is to share lifts to work with friends. There are a few sites that connect people doing the same journey.

  • Liftshare

    Register your details on Liftshare and enter the journey you'd like to share. Then check the results for matching commuters - it also lets you search for potential matches before registering.

    The site's been going since 1998. It reckons a typical daily commuter sharing a journey can save around £1,000/year. It has a nifty savings calculator to help work out how much your journey costs, plus how much you could save by sharing.
  • BlaBlaCar

    Founded in France in 2006, BlaBlaCar came to the UK in 2011 and has 60 million members.You can search for potential matches without registering, but you'll need to register for free using Facebook or email if you want to contact a driver or offer someone a lift.

Anything to watch for?

  • Be safe

    The sites store details securely, but when it comes to travelling it's important to be vigilant. Arrange to meet for the first time in a public place, let friends or relatives know what you're doing and check their ID to ensure they are who they say they are.

  • Taking passengers shouldn't affect insurance

    If you're giving a lift to someone and asking for a contribution towards petrol costs, the Association of British Insurers says that provided there's no element of profit, your car insurance is unlikely to be affected.

    However, to be completely sure, check with your provider first.

Your successes using the five-step cheap petrol system

Do it – you'll be surprised'

Thanks to driving tips from @MoneySavingExp, I have saved myself £20 in fuel in 1 month, driving more carefully. Do it, you'll be surprised.
- MoneySaver @mathewhasker on Twitter

'I doubled my fuel economy!'

Over the last 2 years I have almost doubled my fuel economy, without changing vehicles.

1. I drive much more smoothly and don't overtake other car users just to get one or two places further along in a big queue.

2. I leave for work a little later and return home a little later – as a result I no longer spend 30 mins plus on a 4 mile crawl through stop/start traffic on a 26 mile (each way) commute into and out of Aberdeen.

My blood pressure is also lower
MoneySaver Caleypine

'20 extra miles per tank!'

Results I've got from trying to drive more fuel-efficiently. Most of this has been city driving:

Previously, 33-35 litres gave me around 215 miles.

Driving more carefully increased this to around 235 miles.

Turning engine off at lights increased my mileage to 293 miles.
- MoneySaver Krishna

How much can you save?

The savings from following the five-step system can be huge. For someone who drives 15,000 miles a year averaging 35 miles per gallon (12.4 km/L), just buying petrol at the average UK price would cost £2,549 annually as of May 2019. Cutting this spend by 25% could save £637/year.

To work out the initial approximate cost of running your car, the website has a fuel consumption search tool (it's best for new cars) which will help you work out roughly how much it'll cost you to run your car. Motoring website Honest John also has a handy 'real MPG' section where drivers have reported the miles per gallon they actually get.

Fuel cost-cutting

5,000 miles £840 £798 £672 £630 £210
15,000 miles £2,549 £2,422 £2,039 £1,912 £637
30,000 miles £5,042 £4,790 £4,034 £3,782 £1,260

(1) Cost of unleaded at 35 miles per gallon (12.4 km/L) at 129.5p/L. Last updated May 2019.