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interesting question about manual trannies, downshifting, and gas consumption

posted by  invar on  Thu Nov 13 04:32 CST 2003
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last visit: Fri Feb 26 21:00 CST 2010
[RELATED]

my brother in law asked this of me a week ago.

if you are in a vehicle running at highway speeds and you need to slow down and then proceed to downshift to provide compression/engine braking, does your gas consumption go up because of the increased engine speed (RPMs) or not? my reasoning is that the engine is basically idle when you do that because you're not applying gas, and that the wheels are driving the engine, not the other way around.

so my gut feeling says no, fuel consumption does not increase.
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'






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