Hmmm, my Volare had a 11:1 360 with a way too big cam and a big carb. When I went to the track, I'd put 5 gallons of race gas in it. I could make 3 warm up passes, make 3-4 round passes. Of course for every 1/4 mile pass there was the 1/4 mile back to the pit stall. Roughly 3-4 miles put on it a day. I'd have a small splash of gas left over. So roughly 5 gallons to go 3 miles at 6000 rpm comes out to about .6 mpg.

Could be worse.