If you take your average 87 octane fuel, you can add octane to it and still have crap fuel. It may bear a higher "octane" number but what is the measurement of MMBTU/gallon? What is the specific gravity?
On the other hand, if I were to find a fuel that had an octane rating of 89 but had a higher MMBTU/gallon then I would get more power from the fuel. I could adjust the timing and fuel circuits until the engine produced the most power from the fuel.
The number on the pump means very little except for marketing purposes. Every fuel manufacturer will provide the figures on request.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
