I made the change more for the cost savings over the race season. When I ran race fuel again the last couple years and to complete the season last year the fuel cost was around 1800$ runnign C12. That was 3 drums of fuel. Running E85 I would go through 4 drums a season at a cost of about 165 a drum for a total cost of 660$. For a racer thats a lot of extra tow money.