Klotz Oil Hitrate Racing Gas Concentrate - 1gal. KL-451Converts 92 Octane unleaded gasoline into 105 leaded racing gasoline Increase horsepower and engine efficiency Prevents damaging detonation and pre ignition Smoother engine torque curves for more usable power Converts pump gasoline into High OctaneRacing Gasoline Adds lubricity to dry unleaded gasoline Allows higher compression ratios and advanced timing Mix 1 gallon of HiTRATE to 9 gallons of 91+ octane unleaded pump gasoline