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carfeu carfeu
 
December 20, 2008 04:41 PM

Do you save gas driving your car in idle when going down a hill or is it better to stay in a specific gear?

I never found an answer for this question, and I'm really curious if you save more gas idling your motor or keeping it in gear when going downhill. Do you know?
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tjager tjager
 
 December 20, 2008 05:10 PM
Coasting is in neutral, either EOC or engine on. EOC gives you infinite mpg, engine-on gives you high (100-300) mpg.
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http://ecomodder.com/forum/showthread.php/does-coasting-neutral-coasting-ge...

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spoon spoon
 
December 20, 2008 05:02 PM
What you are talking about is called Free-wheeling. While this practice can, in theory, save you a little gas since your car is not being feed as much gas to move doing so is ILLEGAL. Along with that fact the extra wear on the transmission quickly balances out any savings you might have on the fuel consumption.

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tracebooks tracebooks
 
December 20, 2008 05:14 PM
The idea is you want to have the lowest RPMs, so neutral gives you this.

Of course, turning off the car altogether gives you the lowest RPMs, but both this and being in neutral may be illegal, depending on your state. So be careful!

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drivel drivel
 
December 20, 2008 05:35 PM
It is best to put the car in the highest gear. Driving with the transmission in neutral is not safe.

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eagle6912 eagle6912
 
December 21, 2008 07:44 AM
you would save gas in nuteral going down hill. but it is NOT a safe thing to do.

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