I've known it to be the case for a long time. Now I'd like to know why. The 289 is smaller and better on gas, but puts out more horses. WHY? I assumed that Ford was able to tune the 289 better, without worrying as much about gas mileage as they did on the 302. A close friend of mine says that Ford saw the 5.0 as an engine that could be tuned very easily, and viewed the 4.6 as an engine that didn't need to be tuned. Can anyone answer this question better? Just for the record, I don't think I would dream of trading my 5.0 for a 4.6. The 5.0 just has the right sound to it. You don't have to constantly drive it fast, it sounds cool regardless.