Mpg goes down while idle

[TexasRebel]

You'll get better mpgs leaving it in gear while you coast to a stop. Once you shift into neutral the computer has to dump fuel to keep it running. In gear the engine continues to spin with the wheels. New cars can go super lean afr while coasting but only in gear.

It's a bit of a wash.
Sure there's no fuel being used while coasting in gear, but there is more drag on the driveline to turn the engine over without fuel, so you won't coast as far.

Less fuel used, but also less distance.

Sponsored

 

[okfoz]

Every car I have ever owned continues to calculate MPG even when not moving.. Even when you do the math, you divide the gallons put into the tank by the miles...