Tunes, parts and Mpg
So I have this 07.5 that I've been fight a rail pressure code issue. I have changed almost every thing in the fuel system for different parts and it still sets the low rail pressure and low lift pump codes daily. Something I have noticed was when the truck had the original 400k mile parts on it, I would get 18-19 mpg on the highway just the truck by itself. So as I've switched the injectors, cp3, rail plug, ect. I'm now down to 13-14 mpg highway. I've not changed the tune and fuel pressure is 14-15 psi which FASS says is fine. Anyone else ever had this drastic of a drop by swapping stock parts for stock parts?
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Thanks, Jeremy
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Last edited by DISTURBED; 10-08-2017 at 05:14 PM.
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