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at least if you fill up with the wrong gas on a bike its pretty easy to drain the tank on most.

jmillheiser wrote:Hes right many modern cars will produce more power with premium.

<snip> The same thing should apply to a fuel injected bike that specs 87 especially since bikes have much higher specific outputs than a car.

It takes more than fuel injection. The bike would have to be equipped with a knock sensor that is wired to the timing control in an ECU. Are there any bikes equipped like that yet?

Not counting Diesel , there are only two underground tanks at filling stations . One holds regular and the other holds premium . What you get with mid grade is a 60/40 split with the 60% being regular . So in my opinion what's the point . I run nothing but premium in my scoots . In the days of my Badazz Triumph , I ran aviation fuel and it ran clean and mean .
Kind regards, Wizzard
I think we've had this discussion before or else I am having a severe case of Vuja Dei..................

Wizzard wrote:In the days of my Badazz Triumph , I ran aviation fuel and it ran clean and mean .

Interesting. Back in the 90s I bought an old 50s Cessna that was designed to burn 80 octane aviation gas (very low 6.5 : 1 compression). At the time, the old 80 octane avgas had been discontiued, so I had to run 100 octane avgas. All the extra lead (used to boost octane) wound up in my valves and plugs and the plane usually ran like hell.

At the same time, I owned a Merc convertible with a high compression v-8, (11.5 : 1 compression) and required (non-existant) 99 octane gas to keep from pinging. The highest octane car gas available was 92.

I solved this double dilemna by running aviation gas in the car, and running regular 87 octane car gas in the plane. Both engines were finally running perfectly again.

im suprised they would make an aircraft engine rated for such a low octane. But then again that being the 50s, iirc 100LL didn't exist back then. Though 130octane avaition fuel (the purple stuff) was more widely available then.

I feel sorry for the warbird owners out there trying to find the 130 octane AvGas.

Most of the light plane engines built through the mid 70s were designed to burn the old 80 octane gas. The higher compression versions usually burned 91 octane avgas which was changed to 100 octane when they started phasing out the old 100/130 octane green gas.

Oddly enough, there is a refinery somewhere in the Northwest that still puts out the 100/130 octane green gas. Every time I'm up in Montana they ask me if I want green or blue.