The short answer: Nope. The reason: The common understanding is that going faster burns more fuel and therefore, the slower you drive, the less fuel your car will use, but this actually isn't true. ... Any slower, and your transmission will automatically shift to a lower gear, which requires more fuel to maintain.

Do you save fuel by driving slower?

There's a very simple way to save money on petrol: slow down. A car speeding at 80mph uses 10% more fuel than one cruising at 70mph, according to the Department for Transport.

How much gas do you save by driving slower?

Slow Down and Drive Conservatively

For light-duty vehicles, for example, every 5 mph you drive over 50 mph is like paying $0.18 more per gallon of gas (based on the price of gas at $2.63 per gallon). Reducing your speed by 5 to 10 mph can improve fuel economy by 7%–14%.