I agree with David, about 1 1/2 gal per pass average if you're driving back to the pits. The 10/15 degrees increae is also about right i would guess that the tuneup is pretty much dead on. I burn about 1 1/2 gal per pass but we run a 1/8mi on a qtr track, so it's a long drive back to the pits and mine is a sm/blk.
JMO
Zip.