How to Save Fuel When Driving
Driving techniques and maintenance that genuinely improve fuel economy, with the percentage each one is worth — and the myths that are not worth your time.
Questions people ask
Does air conditioning use more fuel than open windows?
In town, yes — the compressor load outweighs the drag from open windows. On the motorway it reverses, because at speed open windows create more drag than the compressor costs.
What speed is most efficient?
For most cars, somewhere between 45 and 60 mph in the highest gear. Below that, engine losses dominate; above it, air resistance climbs steeply.
Does this page work offline?
Yes, after the first visit. The service worker caches it, so the guide stays available with no connection.
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Last updated 22 August 2026