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I have a 2010 f250 with the 6.4. Mods are dpf delete, egr delete, turbo back exhaust, intake , spartan tune running 275 early lock. I have 37" tires on 22" rims. Gearing has been changed from 355s to 411s. Now here's the problem, gradually I have noticed the mpg getting worse and power seems to be dropping as well. Looking for and advise or ideas here cause I'm stumped
 

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Did you read the stickies.

What you're doing wrong: Big tires and higher (numerical) gear ratio.

I'm not at all suprised your MPG is going down.
 

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Chachi
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Did you read the stickies.

What you're doing wrong: Big tires and higher (numerical) gear ratio.

I'm not at all suprised your MPG is going down.

:whs:, and on that tune you probably drive with a lead foot... which Is another cause of ur mpg decrease
 

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Changing the nut behind the wheel (aka the driver) can make up for a multitude of sins.

I have a mild Swamp Donkey tune and I get about the same MPG as his MPG tune. I am a half-baked hypermiler (mostly I'm Sir Coastalot) and that might be why the performance tune and the MPG tune get the same MPG for me.

Having big tires and a numerically higher R/P ratio and visions of being Tony Stewart would lead to lower MPG.
 
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