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| Re: Acela Speed Question (1037171) | |||
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Re: Acela Speed Question |
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Posted by Terrapin Station on Tue Feb 15 12:27:02 2011, in response to Re: Acela Speed Question, posted by Fisk Ave Jim on Tue Feb 15 12:17:40 2011. A big factor in high speed gas mileage is the transmission. Say for example your your doing 55mph & your tach reads 3000 rpm, & your transmission has a 5th or 6th speed overdrive. Shift up to the higher gear and say do 75, your tach, depending on the vehicle in most cases will go down to say 2800-2900 rpm. With your engine turning less, in theory your milage should improve even at the higher speed. Jim, I think we can assume that in Chuck's automatic transmission equipped Altima (afaik), at a steady 55-60 MPH, the transmission is already in the highest gear (assuming it is the most efficient gear for that speed, which I believe it would be). So the transmission does not play a part as you described. Take Pride,
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