I would looooove to see some evidence of your 22 mpg's on a 68 Bird. Never heard of that. The documented mpg's from the factory were around 11mpg's avg in a 400, up to ~14mpg's on a 350. You claim you beat that by 50%?!?! Sorry, but I have to challenge that. If you have a secrete receipe it may be worth big$$$.