List your MPG on your transplant 5.7 or 6.1

I know I get more than 11mpg with my car but I have never actually checked it. 92 octane, 5.7L stock displacement, custom comp cam, dual quads, 8" converter, 727 trans 4.10 gear. I actually get better fuel mileage than my fathers 67" Coronet with a 400hp 345cid 318, 11" 2500 stall converter, 727, and 2.76 gears.