Ford 7.3 chipped mileage
I have a '99 F-350 dually, 4.10 rear, 4x2, that 3 years old to us. It has a Diablo sports chip in it that is not self programmable. Owner said it was tuned for towing and the chip is so old that Diabl...
Forum Discussion
Twain wrote:
Thanks. The truck is primarily used to tow highway and haul junk around town so I've only used it on the highway empty a couple of times, but 16 is all I see. Towing has ranged from 11.5 - 13 depending on the weather. It's hard to imagine an engine that size with 4.10s, DRW and 4 tons getting into the 20s, but it would be worth the $400 programmer if it did. Towing mileage is decent and that's the one that matters the most to me. Doesn't hurt that our TT is only 9'2" tall.
A programmer will never get you into the 20's with a 7.3. The HEUI injection system on these trucks is a major limitation to both power potential and fuel economy. It takes a lot of hard parts too, in order to start seeing some benefit. You are much better off leaving it stock and saving your money. This is coming from someone who has spent $5,000+ trying to make my 7.3 perform like my stock 05 Cummins; as you can see from my signature, I still miss my Cummins.
