I have the EDGE tuner in my duramax. Definitely makes a difference. Just can't trust employees to leave it alone. They can't even push in the tow/haul button. Hired help, the most stressful part of my life

I also use the Superchips in my 7.3's. Another thing to consider is using a synthetic oil, synthetic trans fluid and synthetic gear lubes in all your trucks. Typically the oil alone will pick you up about 10-15% in fuel economy. Now, that is with a high quality synthetic too, such as AMSOIL or Mobil 1. I personally use the AMSOIL. Synthetic blends aren't going to help out too much.

GO GAS reg gas is .75 cents cheaper than fuel in NJ

WE have 5 V10s pulling loaded construction trailers .
Never have they got better than 5mpg . And for power no way do they even come close to the diesel that always gets better than 8mpg even with the worst driver . No brainer for me .
If the truck is going to be working for a living I think there is only one choice .

Paul

had the v-10, average 11mpg, have had 3- 6.0 diesels, I get 19mpg on highway, Tried out the 6.4 and got 12mpg, like the 6.4 but wont buy it to get 7 mph less than what I have.

12 MPG with 4:88s??????? Who is doing the math. MIne gets 10.5 empty and 6-8 towing. Great truck, but will NEVER buy another Ford. They knew these trucks sucked the fuel when they built it to sell. For that reason alone buy a Dodge or Chevy.

Take a look over here
http://www.thedieselstop.com/forums/

your's was a 450 not a 350...big difference in fuel consumption..also those 4:88 gears did not help.. The 450 is a purpose built truck..plain and simple...Do we all wish they got better MPG's..Yep..but unfortunately not the case. The Ford tows better, has a better suspension than the others. My 350 is now averaging 12.3...freeway @ 65 is 15.1...and improving with miles. My partners GMC dooley is getting .6-1.4 better than I ....but when loaded down over 10k..big difference between the two..just towing the load...performance is better on the GMC though...Good luck on what ever U end up getting. Jeff

I have a Fun Mover with the V-10. It is lifeless. I regret buying it so much that I bought a new Dually and trailer instead. Anyone want a 2001 Fun Mover 31 with 20k on it. I'll cut a great deal!

I could tow 6hrs,about 350 miles with my V 10 before fueling.And thats 10 k or more of weight.I loved it,the best truck I every had,300k and didnt even leak a drop.Fortgot to mention it was a 4x4 crew with a lift and 37"humvee tires.