Race fuel v Pump gas

[Hurst390]

As far as the guy with 9.8-1 you really don't want to run straight race fuel if that's what your doing..if you don't have enough compression for a given octane your losing power and you'll end up with lead tracks on your plugs and a misfire..
If that is a flat top piston I would run 93 with a couple gallons of RF..If it's a dome and big chamber your gonna need more octane..as a general rule..

[Dirtmod13]

We tried e85 and had issues with the quality also. Went to classic non oxy mixed with e98 to get to a true e85. Way easier. Then e85 got banned so we moved the ethanol content down to 30% 3 gal e98 to 7 gallons of classic car 93 octane and worked great for us. It gives u the boost of the ethanol, raises octane and best part- under 4$ a gallon mixed. We won the last race of the season with this mix.