I recently installed the Walker 39425 exhaust and I went from 360 miles to a tank to roughly 300 miles to a tank. There are no codes, I am not lead footing it either. I really thought if anything, my gas economy would go up not down. Have any of you experienced bad gas economy with a performance exhaust? I am really thinking about putting the old exhaust back on.

 

Did you install a CAI?

 

You may have got a bad tank of fuel...

 

I have not installed a CAI, also I have gone through multiple tanks of fuel.

 

With 360 miles per tank I wouldn’t complain I get like 250

 

Did you do the entire cat back exhaust system or just muffler?

 

Did you contact the manufacture for suggestions.

Any performance improvements.

 

I have gotten 300 miles per tank since I purchased mine. I fill it when the "low fuel" message comes on, that's right at 20 gallons (3.5 gallons left). Highway, city, off-road, never seems to make a difference; 15mpg every time. If I ran till empty, I guess I could go 345 miles, but not wild about pushing it to the station.