How to Maximise Fuel Efficiency in an Automatic Car

The three habits that matter in an automatic: press the accelerator like it has an egg under it, use Eco mode, and lift off early. Together they are typically worth 5% to 10% of your fuel - at the current average of 161.2p a litre, roughly £56 to £111 a year for a typical driver. Worth having, and still smaller than choosing a cheap forecourt, where the average town's spread is 10.9p a litre.

• Smooth throttle avoids the kick-down that spikes consumption.
• Eco mode holds higher gears and resists pointless downshifts.
• Anticipation and coasting do the rest - the gearbox follows your eyes.
• Habit is worth 5-10% of fuel; the forecourt choice is worth more.

The automatic advantage

In the past, automatic gearboxes were notoriously thirsty, burning significantly more fuel than their manual counterparts. Modern 7, 8 and 9-speed automatics are a different breed and often outperform human shifting. To get the best economy out of an automatic, you work with its computer, not against it - and the three levers below are how.

Mastering the kick-down

Automatic gearboxes have a feature called kick-down. If you press the accelerator too quickly or too far, the car assumes you need urgent power: it drops down two gears and sends the revs soaring, chugging fuel in the process. To avoid triggering it, imagine there is an egg under your accelerator pedal. Press smoothly and progressively and the car shifts up early and keeps the revs low - which is exactly where an automatic is most efficient.

Using Eco mode

Almost all modern automatics offer an Eco driving mode that remaps the gearbox software. In Eco mode the car gets into the highest workable gear as early as possible and actively resists downshifting when you accelerate gently. It also dials back the power sent to the air-conditioning compressor and softens throttle response, so the egg-under-the-pedal technique becomes the car's job rather than yours. It costs nothing to try on your next tank: the difference shows up as a few percent on the trip computer, or it does not.

Coasting and anticipation

Many modern automatics feature a coasting or sailing function: lift off on a flat road or gentle downhill and the gearbox disengages, dropping the engine to idle while the car rolls on. Look far down the road - the earlier you lift, the more free momentum you gain, and every mile of rolling is a mile the engine does not pay for. The technique is the same as the one in our eco-driving guide; in an automatic, the gearbox simply executes it better than a human can.

What those habits are actually worth

A percentage of consumption only means something in pounds. For a typical driver covering 8,000 miles a year at 40mpg on petrol averaging 161.2p a litre:

Set against the forecourt decision, one 50-litre fill bought at the cheap end of a town's average 10.9p spread saves £5.45 - the same as several weeks of perfect driving technique. Do both: drive smoothly and check where the cheap fuel is today before you fill up.

Two things not to bother with

Slipping the gearbox into neutral at every set of lights saves essentially nothing in a modern automatic and adds wear to the selector mechanism. And "manual" mode is for hills and towing, not economy - the computer's shift map in Drive is already optimised for fuel. The genuine technique differences between automatics and manuals, and why the old thirstiness rule has flipped, are covered in our manual versus automatic guide.

Cheaper fuel beats better mileage

Driving technique is worth a few percent on consumption. Choosing the right forecourt is often worth more: with more than 10p a litre between the cheapest and dearest stations in most towns, a two-minute check before you set off usually saves more than a month of careful driving. Find fuel prices near me or browse prices by region.

Frequently asked questions

Does Sport mode use much more fuel?

It holds lower gears and sharpens the throttle, so yes - used permanently it can cost several percent. Occasional use costs proportionally less.

Is it bad to use Eco mode all the time?

No. It is a comfort and response trade-off, not a mechanical one. If the lag does not bother you, leave it on permanently.

Does using manual mode save fuel?

Generally no - it is there for hills, towing and long descents, not economy. The shift map in Drive is already optimised for fuel, and second-guessing it by hand usually produces earlier downshifts, not later ones. The one exception is holding a lower gear on a steep descent instead of riding the brakes, which saves brake wear rather than fuel.

Do automatics really match manuals on fuel now?

In many modern models, yes - the multi-gear boxes and shift mapping have closed and sometimes reversed the old gap. The detail is in our gearbox comparison guide.

Figures updated 27 September 2026. Fuel prices are the UK average of 161.2p a litre across the 7,986 forecourts we track via the CMA-mandated fuel price scheme; the town-spread figure covers the 526 UK towns with four or more priced stations. Savings percentages reflect typical published eco-driving ranges; annual figures assume 8,000 miles at 40mpg. Averages move daily; live prices are on our UK fuel prices page.