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I was getting 18-21 mpg on the E30 tune with normal 70-75mph highway driving and some spirited city driving (if combined it was 80-85%% highway). I only ran 2 tanks of it though, because F- driving and extra 14 miles to get to the E-85 station every 3 days :p I used a spare 5 gallon jug for awhile, but it smells bad, so F-that too! ;P
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