Thread: Aviation Fuel

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I'm not so sure 100 octane fuel is available any longer. It was replaced a few years back with 100 LL, which is the Low Lead variety. 80, which was tinted red, has all but gone the way of the Dodo bird. 100 LL is tinted green. There was a blue and a purple that had higher octane ratings. There is no air entrainment (sp) involved, as you gain altitude you can manually change the fuel mixture as required. Sniper

I don't know what the blue is, but I remember the purple as being 115/145 from many years ago. (recip fighter plane fuel).

Blue used to be 108/135, but I just checked on this and things have changed. Apparently Avgas 100 is still available, and it's still green, while the Avgas 100 LL is now blue. I haven't flown for a while, (5 years this coming Aug.) and the last 12 years of that was in a homebuilt that I had built. Since I used a converted automotive engine, I could legally use auto fuel, which I did. Things change I guess. Sniper