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Originally Posted by BonzoHansen
It does. I still watch my fuel usage like a hawk, its a good indicators of issues. I lose ~5% on winter gas. The snow tires I used to run cost me another ~5%.
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Wow, I didn't realize winter fuel could cause as much as 5% economy loss! That is the pits....
That could also account for the 0.5 - 1.0 mpg fuel economy loss since changing the rear gears early in winter.
Update: Found this on the Chevron website:
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Oxygenated gasoline reduces fuel economy an average of 2 to 3 percent because oxygenates contain less energy than non-oxygenated gasoline.
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They go on to say other winter factors increase the loss of economy. I'm surprised I was not really aware of how significant the impact of winter is on fuel economy.