Fuel Saving & Economy
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Does coasting save fuel?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
It depends entirely on whether you coast in gear or in neutral. Coasting in gear on a modern fuel-injected car cuts fuel delivery to near zero, whereas coasting in neutral forces the engine to idle and burns fuel continuously.
Coasting in Gear vs Coasting in Neutral
In gear: fuel cut-off kicks in:
When you lift off the accelerator but stay in gear, modern fuel-injected engines enter a fuel cut-off mode, injecting little or no fuel while the drivetrain slows the car. This is the most fuel-efficient way to decelerate.
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In neutral: engine idles and burns fuel:
Dropping into neutral — or pressing the clutch — forces the engine to idle at around 700–1,000 rpm to keep itself running, consuming fuel the entire time. This is less efficient than staying in gear.
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Neutral coasting is also a safety concern:
Coasting in neutral reduces engine braking and gives you less immediate control of the vehicle. The Highway Code advises against it for this reason.
What Actually Saves Fuel When Slowing Down
Anticipate and lift off early:
Looking further ahead and easing off the accelerator well before a junction or traffic light — while staying in gear — maximises the fuel cut-off benefit and reduces brake wear.
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Change down progressively:
As speed drops, changing down through the gears keeps the engine in fuel cut-off for longer rather than forcing a single sharp brake application.
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Smooth acceleration matters too:
Avoiding sharp acceleration after a stop is just as important as how you decelerate — aggressive throttle use can add 20–30% to fuel consumption.
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How Much Can Eco Driving Actually Save?
Up to 15% fuel saving:
The Energy Saving Trust estimates that adopting smooth, anticipatory driving techniques — including proper engine braking — can cut fuel use by up to 15%.
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The price you pay per litre still matters:
Even efficient driving habits are undermined by overpaying at the pump. Checking live prices at stations near you with CheckFuelPrices before you fill up stacks additional savings on top of your driving economy.
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Sources
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