does driving at a constant speed (pressing the accelerator constantly but with varying amounts) give better gas mileage or does getting to a certain speed and coasting for a while before pressing the accelerator do better? Why?

Question

I feel like the first one should do better, but I don’t get why, and while I’m driving I keep thinking the second version will somehow end up better – but how do hills affect this?

In: 3

Answer 1

The more consistent you are with the pedal, the better mileage you get. This is why cruise control is recommended during long drives.

Your engine has a specific set of conditions to be in for maximum efficiency. The transmission tries to keep it in this set of conditions. By accelerating more or less, the engine is forced to leave this efficiency zone, so it is less efficient when you’re accelerating *and 100% inefficient when coasting*. The result is a significant drop in gas mileage.