Impact Of Flow Through Exhaust on MPG?

[pjschwartz]

I have a 2000 Ranger (XLT, Ext Cab, 4x4, 3.0) and am thinking about installing a flow through exhaust from the cat back. For those of you that have done it, did you experience an increase or decrease in gas mileage?

 

[Original_Ranger84]

I put a Dynomax super turbo cat back system and didn't really notice a change in MPG maybe 1 or 2 hwy. On my xlt, 4dr ex cab, 4x4, 3.0L. An exhaust system alone you aren't really gonna notice a difference. The biggest mpg change you can do is how you drive.