SG2 works off air flow so when you change your fuels it losses accuracy, E0 to E10 might not make much difference but when I had my SG2 in the Stratus running higher blends it still is a good tool for instant feed back but the numbers are wrong.
Yeah there's not a lot of money to be saved in different fuels when your getting 40 mpg, 12.5 mpg Suburban it makes a much bigger difference.
With the Impala it make filling it up a whole lot easier on the wallet. 15 @ $1.53 instead of $2.35 is $12 less per tank, granted the tank doesn't get my wife as far.
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