[pococj]

The only wonders it'll do is empty yer wallet faster than a cheap Tijuana wh... Never mind!

Your engine will run best on some particular octane gas. Running lower than that octane will result in the ol' knockin' routine, and may damage something from that detonation. Running higher than that octane does nothing for your motor, only the gas companies.

Something else to consider is the gasoline additive packages. I ain't no sky jockey, and don't know how av gas additives differ from earth-bound gasolio additives. It may lack something that is beneficial to your bike's engine, but isn't used in av gas because of reliability issues, as in "sure hope my plugs don't foul!"

Since gas no longer has lead we now have plugs that last forever. No lead deposits to foul them, and no lead deposits built up in the combustion chamber. With modern metallurgy in the valves and seats, lead isn't needed to cushion the valves slamming into the seats, and will do more harm elsewhere than any perceived gain.

I've been running an experiment with my '87 Evo motor. It is bone stock internally, with modified drag pipes and the carb properly jetted. Also has stock ignition system. Here are some gas mileage figures with 93 & 89 octane:

93 - 49.5, 47.4, 48.6, 49.8, 53.3, 44.0, 50.2, 42.1, 52.4, 52.5, 48.6, 53.0, 51.2, 49.9, 47.6, 49.2 = 49.3 avg.

89 - 40.4, 46.9, 46.9, 50.2, 42.7, 44.6, 47.1, 46.1, 52.3, 46.9, 50.0, 49.1, 55.1, 53.1, 50.4, 44.5 = 47.9 avg.

The 1.4 mpg difference is statistically insignificant, especially considering I didn't closely monitor my speeds, except to note when I ran considerably above or below my normal. Seat of the pants can't tell any power difference, either. But I have noticed a very slight increase in pinging when I get on the throttle very hard. A quick downshift and the pinging is gone. Overall I'm satisfied the less expensive 89 octane is working fine.

What's all that got to do with running av gas? Don't waste your money.