Losing MPG

Bob Kazamakis

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At a higher altitude I'd think your engine is just working harder to "feel" normal (read more throttle pedal) and that's where the decreased gas mileage would come for.

Power is for sure decreased at higher altitude but the ratio of air to fuel will be the same going into your engine. If you kept the throttle input the same as a low altitude then mpg's shouldn't change theoretically.
 

Bru

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Winter blends have less energy per density so in theory it takes more fuel to go the same distance. The difference isn't that much, however. A combo of ethanol percentage, winter blend and colder temps could be the culprit.
 

CrunkMaro

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Jun 17, 2010
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winter gas it is.

my city mileage goes down by 3-4
my highway mileage goes down about 5-6 between winter/summer.

check out RVP (reid vapor pressure),(vapor pressure at 100 degree F)

winter fuel uses more butane which has a higher RVP, but evaporates quicker (higher RVP evaporates quicker than low RVP)



or your muffler bearing went out. could be that

or a dent in your o-pipe
 
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