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      10-17-2010, 02:12 PM   #1
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Question high RPM coasting?

Just a general question im curious to know about...i dont know much about mechanics or how an engine works but if u hold the car at a higher RPM, BUT DONT, step on the gas, say, if u going downhill coasting or something, does it burn fuel just as if you were stepping on the gas?

common sense tells me more rpm = more gas...but if u dont put on the accelerator, wouldnt it just be the same as taking your foot off the gas in any gear? be it 1,2 or 5 6?

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      10-17-2010, 02:20 PM   #2
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Throttle position has alot to do with injector %.. So no throttle means very little fuel but rpm does also change it a little, so you will use more gas at higher rpm with same throttle position.. Using the gears to slow the car is fine/correct.

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      10-17-2010, 02:29 PM   #3
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I believe zero throttle = zero fuel if above something like 1200 rpm.

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      10-17-2010, 04:39 PM   #4
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Like when you downshift into second gear, engine screaming as you come to a stop with no throtttle?
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      10-17-2010, 06:22 PM   #5
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Originally Posted by Radiation Joe View Post
I believe zero throttle = zero fuel if above something like 1200 rpm.
That's correct. Engines driven in that fashion are more likely to burn oil, rather than fuel, due to high vacuum.
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