Ran 100 octane for the first time. Wow

remember the myth "you dont need hi octane" during the gas crunch days? They stated that high octane gas actually produced less power per lb than regular gas in a "regular" gas motor. All things being considered, they never mentioned elevated compression of a built motor. If you build a motor for high octane use, ie higher compression (propane), youll reap the benefits. If you dump 105 in a 74 318, youll probably lose power but only if you are looking at a dyno. Av-gas 118+ was made for 30 inches boost ie. P-51 or P-38 Packard-Merlin/Allison turbo-supercharged motors.

Ha, just read the previous post...yup