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Old 03-04-2011, 05:31 PM   #21 (permalink)
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Join Date: Nov 2010
Location: St. Louis
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Grand Prix - '02 Pontiac Grand Prix GP
90 day: 24.01 mpg (US)
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Originally Posted by johnlvs2run View Post
What is the difference in f/e from being stopped in drive vs neutral?
After I started trying for better FE, but before I got my UltraGauge, I slipped into N at stoplights. After I got the UG, it showed me that the difference between idling against the TC vs idling in N was about .1 gph. So for $0.30 per hour of idling, I choose to leave it in gear.

Idling against the TC does take more fuel, but not as much as I expected. An offsetting factor is that the idle speed goes down when in gear (on my car).

Oh, and about 225 miles/week for the commute.

Last edited by abell75; 03-04-2011 at 07:21 PM.. Reason: miles!
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