Whcih is the most complecated engine to repair? 4.6 or 5.4?

Which is the most efficent tower in means of mileage?

Which is the best for a truck of that size?

Please respond!


F350 555

 

They're both basically the same animal. The variable cam timing system in the '04 5.4 might have it's own set of idiosyncrasies, but I haven't had one apart yet so I dunno.

Neither is going to get stellar fuel mileage with a load behind it. I averaged 10-12 mpg with a 5 or 6000 lbs truck and trailer attached to mine.


With the '04s weighing in at anywhere from another 500 to 700 lbs more than an '03 or '04 Heritage, I wouldn't even consider the 4.6 in that truck, but that's just me.