Quote Originally Posted by jut703 View Post
When coasting long enough, a car will go into DFCO (deceleration fuel cut off), wherein it uses zero fuel and the car is kept running by the momentum generated from the kinetic energy of the turning wheels.

That's why most hypermilers use the pulse and glide technique, where they will accelerate for a certain length of time, and then coast for an equivalent length of time. During the coasting bit, the car uses zero fuel and thus when averaged out, it comes out more efficient than having your foot on the throttle consistently. However, as a caveat, you can only execute pulse and glide with light and predictable traffic as you have to have lots of room to accelerate and coast repeatedly.

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This answers my question that I couldn't ask! I've been wondering why the needle will point out to the highest level whenever I let go of the pedal. I might try this pulse and glide thing and see how it works.