e85 is 105-109 octane depending on summer or winter blend. it is more like e75-80 in the winter for easer starting. we burned this in our 13.5 to 1 engine with no problems with a header temp in the 1250s. we competed in mega bucks race last year and finshed in the top 15 all three days in st. louis. lost on light.
we made 3-4 dyno rear wheel pulls. we did lose some hp over methonal but bracket racing is about consistancy.