Why?

AV gas is formulated to run in cold to very cold temps with much less oxygen molecules than on the ground. Also, aircraft piston engines are not high compression. Because of this it has less BTU's per unit than comparable 'race' gas of similar octane. And when run in a performance engine, especially carburetated, the fuel droplets tend to vaporize in the intake manifold, leading to further issues running lean and stumbling on hard acceleration.

I tried this in the mid '80's on a hot street BBC 468 with nitrous. It just never ran to its expected potential. The plugs read lean even though the jetting would've been 'fat'. I knew some of this going in, but AV gas was less than 1/2 price per gallon than Cam II at that time. I could not tune the short comings out of it. I switched back to race gas and immediately noticed better overall performance and had to pull some jetting out of it

Bought around 8 gallons today at our WaWa for use in my power equipment & motorcycles:

http://forums.pelicanparts.com/uploa...1689092502.JPG

In my area only marinas sell non-ethanol now.

I will worry about it October.

For years I had used a 300 gallon tank of non ethanol 91 octane for all my yard equipment toys and airplanes. A local fuel distributor would come out with a truck and fill it on demand. My airplanes had/have autofuel STCs which allow me to run non ethanol car gas vs the very expensive 100LL Avgas. This worked great and I had no fuel related issues with seldom used equipment or toys.... Then suddenly the supplier quit carrying it. A couple years ago another supplier in another town started carrying and I am back in business. :)

For a few of those years when I was racing a dirt car, I needed a bit higher octane for about an 11:1 V8 race car engine. I ended up going to the local airport every couple of weeks to fill some jugs with 100LL Avgas as I was too cheap to buy the more expensive and higher octane "race gas" at the track (I would mix the 100LL 50/50 with premium pump gas... Race car ran great on it for 4 summers of nearly every Saturday night racing). For those couple years I would siphon out seasonal use equip and toys and re-fill with the Avgas for the down season. Avgas could sit I bet for 10+ years and still work perfectly. It however costs too much to run in all my equipment year round. Luckily I now have the non-ethanol 91 back in my home tank and I don't have issues.

I have never had a problem finding 90 octane ethanol free fuel in my area, even the local Walmart has a dedicated pump for it. I use it in my lawn equipment.

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