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My Cobalt seems to like a E30, last 4-5 tanks have been E30 with average of 33-34 mpg, but temps were in single digits to -20. Current tank about half gone with normal driving temps 20-40 I'm over 37 mpg indicated, last year same time with E10 was 38-39, but have winter tires this year vs LLR last winter.
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