Coppers on Ainaloa

[Midnight Rambler]

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Originally posted by mdd7000

Putting the car in neutral does not save gas. The fuel injection systems are designed to actually close off - shut off - the flow of fuel when you take your foot off the gas pedal and coast, in gear. There are some additional variables that the computer takes into account, but for all practical purposes, the injectors turn off.

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But being in gear, even the highest one, slows the car down, so you may have to step on the gas to maintain speed when you wouldn't when coasting free in neutral. So it does save gas that way. You can also see the tachymeter drop when you shift into neutral.

Presumably the law against coasting is due to the possibility you might need to maneuver by accelerating. I still do it though, but I keep my hand on the stick when a car comes by in the other direction.