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How to use less fuel

Which economy tips are backed by measurable savings, roughly what each is worth, and which ones are folklore.

6 min read · Written by Sam Richards · Last reviewed 2026-08-17

Key takeaways

Dropping from 80 to 65mph on a long motorway run can cut consumption by around 15%.
Under-inflated tyres cost fuel every mile and are the cheapest thing to fix.
Shopping for the cheapest local station is usually worth more than any single driving change.

Speed is the biggest lever

Aerodynamic drag rises with the square of speed, and the power needed to overcome it with the cube. That is why the same car returns dramatically worse economy at 80mph than at 65mph on the same road.

Department for Transport figures put the difference between 70mph and 80mph at roughly 10-15% for a typical car. On a 300-mile trip that is real money and about fifteen minutes of time.

Maintenance and weight

Tyres 20% below their recommended pressure increase rolling resistance measurably and wear out faster. Checking pressures monthly is free and pays for itself.

Roof boxes and bars are the biggest single avoidable drag penalty — often 10-20% at motorway speed even when empty. Take them off when you are not using them. Removing 50kg of junk from the boot is worth a percent or two.

Check tyre pressures monthly and before long trips.
Remove roof bars, boxes and bike racks when not in use.
Service on schedule — a clogged air filter or worn plugs cost economy.

What barely matters

Air conditioning costs a few percent in town and effectively nothing at motorway speed, where open windows cost more in drag than the compressor does in load. Use it.

Coasting in neutral is not more economical in a modern car — a fuel-injected engine on a closed throttle in gear uses essentially no fuel at all. Fuel additives and "economy" magnets sold online have no credible evidence behind them.

The largest saving available to most drivers is not in the driving at all: a 10p per litre difference between two nearby forecourts is around 7% off the fuel bill, achieved by checking prices before filling up.

Frequently asked questions

Does driving slower really save fuel?

Yes, substantially at motorway speeds. Reducing from 80mph to 65mph typically cuts consumption by around 15% because drag rises sharply with speed.

Does air conditioning use a lot of fuel?

A few percent in stop-start driving and almost nothing at speed. At motorway speed, opening windows instead costs more in aerodynamic drag than the air conditioning does.

Do fuel-saving additives work?

Aftermarket "fuel saver" devices and most additives have no credible independent evidence of improving economy. Correct tyre pressures and regular servicing do.

Prices come from the UK Government's Competition and Markets Authority (CMA) open fuel price scheme and refresh throughout the day. Figures older than seven days are excluded.