Oh, I really tried to stay out of this one...

Anyway, due to security restrictions, you can't buy avgas at a big (controlled) airport. However, last I checked, you can buy it at the smaller country airports with no problem. Generally I show up with my hot rod boat, and they wave me on through any gates there might be, and fill my boat and my cans up.

Now....

a. You will pay much more than for pump gas.
b. You will gain nothing in power.
c. You will subject your engine to increased deposits and carbon build up.
d. There will probably be no significant change in operating temperature.
e. The engine will probably be harder to start, especially in colder weather.
f. Your spark plugs will likely foul due to various deposits from the fuel.
g. Yes, the quality control of the fuel is much better, but with all the negatives for model use... who cares!!??

Hope this helps,
Sorry if I've been "short",
AV8TOR