# low RPM + low MPH = bad for car?

**URL:** <https://forums.speedlife.net/t/low-rpm-low-mph-bad-for-car/29309>\
**Category:** NYSpeed Automotive\
**Created:** [May 15, 2007, 3:58am UTC](https://forums.speedlife.net/t/low-rpm-low-mph-bad-for-car/29309 "2007-05-15T03:58:39Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![HotRodKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/hotrodkid/32/7609_2.png) [@HotRodKid](https://forums.speedlife.net/u/HotRodKid)\
**Post date:** [June 27, 2007, 1:54pm UTC](https://forums.speedlife.net/t/low-rpm-low-mph-bad-for-car/29309/10 "2007-06-27T13:54:06Z")

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its either proper amount of fuel or NO fuel

LESS fuel then the engine needs = running uber lean, and thats bad

decel fuel shutoff is a great thing, and the mpg gauge maxes because your using NO fuel, meaning you have an infinite mpg rating

it doesnt do it in nuetral because if it killed the fuel, you would have to restart the car using the key, where as when the ecu kiks out of decel fuel shutoff the engine is still spinning rombeing in gear, apply fuel and spark and the engine is once again running

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