Cheap Petrol & Diesel

Cut prices & improve fuel efficiency

cheap petrol & diesel

While petrol prices have remained fairly steady over the last couple of months, RAC figures show motorists are still shelling out an average of almost 9p/litre more for unleaded now than 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

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 and painless way to benefit the environment too. 

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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 less fuel – better for your wallet, better for the environment. The key is to drive smoothly. Here are the seven tips you need to know.

  • 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.

  • 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.

  • 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.

  • 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. 

  • 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.

  • 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. 

  • 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 PetrolPrices.com and after registering, enter your postcode and tell it how far you're willing to travel for fuel (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 Durham postcode, the price of unleaded within a five-mile radius on 15 October ranged from 124.9p/litre to a pricey 145.9p/litre. And while the difference per litre may be pennies, in terms of percentage that's an increase of almost 17%.

Also keep an eye out for short-lived fuel discount promos that pop up from time to time. There aren't currently any on that we know of, but we'll publish details here when there are.

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:

  • 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.

  • 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.

  • 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.

  • 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 them. They are a great way to shave the cost of your fuel, but ALWAYS abide by the golden rule...

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 dwarfs the cashback you'll earn. For full details on what to consider before applying, see Credit Card Rewards.

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 Credit Card Rewards.

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 for the first three months on your first £2,000 of spending (max £100 cashback), then 0.5% cashback on up to £5,000/yr and 1% above this. You need to spend at least £3,000/yr to earn any cashback.

Note: As it's an Amex it's not accepted everywhere and you usually won't get the bonus if you've held an Amex card in the past two years (see FAQs).

Would you spend over £9k on it in year one, or £10k+ from year two? In that case, try the Amex Platinum Cashback card (eligibility calculator / apply*). It has a £25 annual fee, but gives the intro 5% rate on up to £2,500 of spending (so max £125) and then tiers up to 1.25% in cashback, so is a winner for bigger spenders. Repay IN FULL or it's 28.2% rep APR (incl fee).

Representative APR (variable): 22.9% (see Official APR Examples)
Important: Repay IN FULL every month to avoid interest
Cashback: 5% in first three months (max £100), up to 1% after
Annual fee: None
Min income: N/A
 
  • Cashback will be paid to your account annually – in the month after your card anniversary date.

  • To qualify for the introductory bonus, you can't have held any of the following American Express cards within the past 24 months: Platinum Cashback, Platinum Cashback Everyday, Platinum, BA Amex, BA Premium Plus, Preferred Rewards Gold, Starwood Preferred Guest, Amex Nectar, Amex Rewards/Low Rate/Purchases.

See how likely it is you'll get this card

MSE's Eligibility Calculator

Go straight to the lender

Apply*

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 about £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 70 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 £2,490 annually as of October 2019. Cutting this spend by 25% could save £622/year.

To work out the initial approximate cost of running your car, Gov.uk 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

ANNUAL MILEAGE AVERAGE ANNUAL COST (1) CUT FUEL COSTS BY 5% CUT FUEL COSTS BY 20% CUT FUEL COSTS BY 25% POTENTIAL MAX SAVING
5,000 £830 £789 £664 £623 £207
15,000 £2,490 £2,366 £1,992 £1,868 £622
30,000 £4,980 £4,731 £3,984 £3,735 £1,245

(1) Cost of unleaded at 35 miles per gallon (12.4 km/L) at 127.9p/L. Last updated: October 2019.

How does the cost of fuel break down?

Tax makes up a hefty portion of a litre's cost. The current fuel duty rate for petrol and diesel is set at 57.95p/L, and you pay 21.5p/L VAT on petrol and 22p/L on diesel.

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