Insurance and fuel together account for over half of what the average British driver spends on a car. Both are more elastic than people assume — the same driver, in the same car, on the same commute, can pay wildly different amounts depending on a few decisions made once a year.
Insurance: the big annual win
1. Never auto-renew. Renewal quotes are priced on the assumption that you will not look. Comparison sites take fifteen minutes and routinely produce savings in the hundreds. This is the single highest-value hour in the motoring year.
2. Use more than one comparison site. They do not share insurer panels. Run two or three, then check the handful of large insurers that refuse to appear on any of them.
3. Ring your insurer with the best rival quote. Retention teams have discretion that the renewal letter does not. Ask specifically to be moved to the new-customer price.
4. Quote 21 to 26 days before renewal. Insurers price last-minute buyers as higher risk. Quotes tend to be cheapest around three weeks out and climb sharply in the final few days.
5. Check your job title wording. Insurers price occupations, and different honest descriptions of the same job can price differently — “kitchen assistant” and “chef” are not the same to an actuary. It must be accurate; deliberately misdescribing your job invalidates the policy.
6. Add an experienced named driver. Adding a low-risk second driver who genuinely uses the car occasionally often reduces the premium. Naming the main driver as an occasional one to disguise who really drives it is fronting — it is fraud, and it voids the cover.
7. Pay annually. Monthly instalments are credit, frequently at 20–30% APR. If you can find the lump sum, this is a guaranteed double-digit return.
8. Increase the voluntary excess — carefully. Going from £150 to £400 lowers the premium, but only take on an excess you could actually pay tomorrow.
9. Estimate mileage honestly but accurately. Many drivers overstate. Your MOT history has the real numbers. Lower genuine mileage means a lower price.
10. Consider telematics if you are young or low-mileage. A black-box policy is often the difference between insurable and uninsurable for a driver under 25, and for anyone doing under 5,000 careful miles a year it can be the cheapest option on the market.
11. Park it off-road if you can. A driveway or garage against “on the street” changes the risk profile, and so does the postcode you keep it in overnight.
Fuel: habits beat gadgets
12. Check tyre pressures monthly. Under-inflated tyres increase rolling resistance and wear the edges out early. Two minutes on a forecourt airline, and one of the very few free efficiency gains that is real. The correct pressures are on a sticker inside the driver’s door frame or fuel flap — and in your owner’s manual.
13. Take the roof box and bars off. Aerodynamic drag at motorway speed is expensive. Empty roof bars can cost several per cent of your fuel economy for the eleven months of the year you are not going camping.
14. Slow down on the motorway. Fuel use rises steeply with speed. Dropping from 80 to 70 mph typically saves around 10–15% on a long run and costs you a couple of minutes an hour.
15. Read further ahead. Anticipating traffic and lifting off early rather than braking hard is the whole of “eco-driving”. Smoothness is worth more than any device sold to improve it.
16. Do not idle to warm up. Modern engines warm faster when driven gently. Idling on the drive burns fuel and moves you nowhere.
17. Fill up away from motorways. Supermarket forecourts are usually several pence a litre cheaper than motorway services. Over a year of full tanks that is real money, and a fuel-price app makes it effortless.
18. Empty the boot. Not the biggest factor by a long way, but carrying 50kg of things you have been meaning to take to the tip does cost fuel.
Servicing, tyres and the rest
19. Use a good independent garage. Once a car is out of manufacturer warranty, a trusted independent typically charges a fraction of the main-dealer labour rate. A service to the manufacturer’s schedule at an independent garage does not invalidate anything, provided the right parts and oil grade are used and the work is recorded.
20. Do the easy jobs yourself. Wipers, bulbs, air filter, oil and filter, and often brake pads are within reach of an ordinary person with basic tools. Labour, not parts, is what makes those bills large. The eight-job list.
21. Fix advisories before they become failures. The advisory notes on your last MOT are a free forecast of next year’s failures. Dealing with them in your own time, at your own choice of garage, is always cheaper than dealing with them in the two days before your test expires. The pre-MOT checklist.
Fuel-line magnets, £30 “remap” dongles, fuel additives promising double-digit economy gains, and running the tank low to “save weight”. None of these survive controlled testing. Anything claiming a 20% fuel saving from a device costing less than a tank of petrol is selling you a story.
What this adds up to
A driver who shops their insurance properly, keeps their tyres inflated, services at an independent garage and does a couple of jobs themselves will typically save somewhere between £400 and £900 a year against a driver who does none of it — in the same car, on the same journeys. That is before you consider driving fewer miles, which at 47p a mile is the largest lever of all.
Sources: cost-per-mile and average spend figures — NimbleFins. Last reviewed September 2026.