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Bad mileage with 5" turbo-back exhaust?
Have any of you experienced worse fuel mileage with 5" exhaust as opposed to say, 4"? I went from stock 3.5" to 5" straight piped, and added an edge tuner (on economy tune), and my mileage has not gotten any better, maybe a little worse. Is my 5" too much free flow? I love the look and sound, and my egt's are great!
I tuned the truck back to stock and still didn't get any better, so I don't think the tuner is the problem.
My truck is a 2007 F250, 6.0, with the bulletproofing mods as well.
Last edited by BigChad; 09-21-2011 at 08:06 PM.