Read it again, I said there were exceptions, I had a 400 that would get over 20 in a cordoba........ And 400's in trucks, that wouldn't get 8MPG. Hell, my 390 will get 16 with 4.10 gears and four back tires.....
The Cummins will get 30 running half drain oil.......
472 Caddy's will get over 20mpg too........
But as a whole, 90% of the people in the world, didn't hit the sweet spot like you did, and are getting 10MPG with the same engine, close to same build.
