F350 vs F450 towing and fuel economy

Funny you say I had my fill but I don't think so. The shop I use works on 7.3L's to 6.7L's and he told me in good conscious he can't recommend a 6.4L because of their repair cost. He likes the 7.3L's and wins truck pulls with one but he also likes the 6.0L's and I think is preparing one to pull with also. I really wanted a 6.7L but my wallet laughed at me so I test drove a 6.4L and was impressed with how much quieter and smoother it ran than both my 6.0L's that I have had. I also read up on how much power you can get out of that engine with a tune and exhaust/intake and I think that sold me. I hesitate to say anything about a 6.0L on this forum for fear of starting a 10 page firestorm but I can say after driving a 6.4L (work service vehicle) and 2500 miles in this 6.7L that I am still impressed with how efficient and powerful the 6.0L is when modded correctly. Its getting harder to find one with lower miles and they are now asking a premium for them because they are pre DEF/DPF so to be honest I am torn between them all. I love the 6 spds of the new 6.7L but it's hard to justify (in small business) the price you can get a small airplane (used) for a new diesel pick up truck.

sandpiper1 wrote:
Looks like from your signature you have had your fill of 6.0L Fords. My 2004 F350 compared to the above poster's 6.4L F450 gets about 10mpg towing my 13k or 14k lb 5th wheel. I get near 17mpg on the highway running empty. If I was looking for a new truck to do what you are doing, I would look foor a low mileage 2007 6.0L F350 DRW and put the money into the engine to solve all the known common problems. But, if I had plenty of money I would get the 6.7L. The 6.4L is a great motor and pulls like a beast but the ones I have driven will drain you wallet when it comes to fuel mileage.