Not being a wiseass or anything like that, but obviously you've never had a Private pilot's license and had to fuel up in Bumfuck, Egypt or some little airstrip in the middle of nowhere . . builds on the pucker factor . .

But you have to remember, a Connie 4 ain't much different from a Volkswagen and they're not to picky about what they burn . . A little higher compression generally so they need more octane, but the biggest concern is cleanliness, no water or dirt. And in the older ones, lead in the fuel . . for some reason some of the older Av powerplants don't take to the new anti-knock compounds used in Fuels . . There's a reason, just don't know what it is . .

Where it's stored and the chain of supply would be my main concern. Racing fuel, generally, comes from 55 gal drums and unless a partial drum sits for a while in the heat and cold, it's generally cleaner than AvGas that's been in a 3000 gal storage tank. But that's why we use filters . .

To each his own . . .

fwiw, i`ve got a vortec 383 with around 11.5 comp and have made passes with 100 ll. so far so good.

I HAVE RAN FROM 468-555ci ALL 13.5 COMP TO 14.8 AND HAVE NEVER HAD A ISSUE. I RUN 40 DEGREES TIMING, AND NORMALLY SHIFT THEM AROUND 7000-7200. I HAVE RAN THIS FUEL SINCE 1999 AND HAVE WON MANY RACE'S AND MADE MANY PASSES WITH NO PROBLEMS. I MIX 8 OUNCES OF 2 CYCLE OIL IN 55 GALLONS OF FUEL AND WORKS GREAT.

ok thanks guys