I'm checking my gas mileage now on a trip to Dawsonville, GA. Basically stock '35 fordor with 85 hp, 221ci, 21 stud engine. 3.78 rear gears, w/7.50-16 rear tires. Drove ~ 450 miles yesterday, mostly Interstate highways @ 55 to 65 mph. Averaging about 16 mpg. I think I could improve on the mpg with a good tuneup.