I dunno how you guys get the gas mileage that some claim. Ford's own testing couldn't even get it that great and they had ever reason to wring out every MPG. (AOD cars got 18/25)
That's what a stock 5.0 was rated for. WHen my 5.0 was stock, i used to see that only when i drove it like an old lady. When i was out having fun, my mileage went WAAAAY down. Even further down with modding.
Even my new 4.6L Mustang is rated at 18 city, 26 highway. It will do this but once again only if i drive "boring".
Mustangs are hard to drive normally, and my modded Fox used to get terrible fuel milage. I think i averaged 14MPG with 3.73's.