Standard measure of the performance of an engine or aviation fuel.
1
E85 has a 104 octane rating, compared to the usual 91 or 92 rating for premium gas.
2
Nesbitt says the octane rating equivalent for natural gas is 130, so the engine required specially forged high-compression 12.5:1 pistons and high-lift, short-duration camshafts.
3
Octane Rating: The octane rating of a fuel determines the propensity to explode rather than simply burn when mixed with air and ignited.