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Diesel is probably the way to go for enduro racing.
If you're going to be heavily modifyin the engine biofuels(ethanol) actually can produce alot more power, but they have to be completely retuned. E-85 really sucks when its run on a flex fueler because those are designed to pretend its gas. . .and its not. E-85 can be compressed much much more than gasoline without risking any expensive problems.
For sheer convenience gasoline is probably still the way to go for short races(sub 200 miles).
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