e85
I buy e-98 buy the drum for 2.50 ish a gallon and mix it with super unleaded. That way always the same mixture everytime. E-85 itself won't automatically make you faster but with higher octane rating (e-85 is 105) can advance timing more plus intake charge is cooler. If you building up engine can easy handle much more compression(12.5/1 on mine). Boosted cars really love e-85 due to the cooler temps. Carb does need to be made to run it as it takes alot more fuel.
As far as rocket selling e85 the octane level is higher since it is mixed with race gas but it also $6+ a gallon.
Troy