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Let's do the math using the EPA's findings of 4% decrease for E10 vs. pure gasoline. Say that I'm driving 16,000 miles per year (consuming 1000 gals / year @ my previous 16 MPG rate)
E15 MPG would reduce to 15.4 MPG which means that I would consume 1039 gallons of fuel of which 935.1 gallons (90% of 1039) would be pure gasoline. For a total gasoline savings of 64.9 gallons. When pure gas was available along side E10 it was typically 10 cents more per gallon. So, my total cost at today's prices would be:
E10: 1039 @ $3.79 = $3,937.81
E0 : 1000 @ $3.89 = $3,890.00
So, even at what the EPA claims the reduction to be I would be paying more money to use E10. It doesn't take long reading through posts on this site to see the vast number of people talking about their performance with pure gas vs. E10 to see that a 10% efficiency difference is normal.
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