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Old 12-01-2013, 05:48 AM   #2
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Location: houston, TX
What I Drive: 04 infra red Svt, 03 2.3 red sedan

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Plain and simple... Winter blend gasoline. Since your from Canada not sure if they do that up there but in the states they do. So what happens is they add more butane, up to 10% instead of 2% in summer months thus giving you less miles per gallon. up to 10% less mpg.
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