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e85 is highly overrated, IMO. I've used it in my company-car Impala and was not impressed. Whereas I normally see about 20-22 MPG w/ mixed city and freeway driving using Reg 87, when I switched to e85 ($2.69 in 'burbs of Chicago), I struggled to get 14-15 MPG. If my math is correct, that's a 30-36% decrease in fuel economy. It was startling to say the least.
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