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...
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My 250 7.3 6spd gets 20 mpg unloaded consistently on paper. 14 mpg towing. I recently started using additive mixing 50\50 and now get 30+mpg on diesel empty, haven't towed with it yet. I know, you say I'm full of poo with those numbers, but I can prove it any day of the week.
