Race-Gas 100032 Race Fuel Concentrate 100 to 105 Octane Labratory proven to raise the octane, chemical energy and oxygen of pump gas to equal race fuel Patented unleaded formula will raise octane of pump gas up to 105 (r+m/2) Will not harm catalytic converters, O2 sensors or fuel system components Proven in any engine that requires high octane fuel including 2 Stroke and E85 engines Contains no alcohol