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Alright, Well I am new into the Forum world but I need some help.

I have a 2007 Classic Duramax.
MODS: K & N Intake with cover off the top, Magma Flow full exhaust 4inch (from downpipe), EDGE Evolution CTS.

Tire size - 285/75R16

It says the tuner will change the Speedometer, but I am not quite sure. I travel 50 miles a day on the highway is all, a little city driving. Do I go off of the Trucks MPG or the Tuners MPG?

Thanks :help
 

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the truck trip od and do the math by hand
 

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I'm That Guy...
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Hand calculate.
 
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