I think I'm getting really bad mileage on the interstate since I took my magnaflow off... Do ya'll think It could be from the straight pipe?

This is what is on my truck 05 F-150 FX4Scab, 325/60r18's, K&N CIA, Edge Evolution(level 2 w/87oct), dual exchaust 3.5" tips, 2"levelin kit...

Also, people who have the edge - what's ya'lls gas mileage?

 

keep your foot out of it, I know you like to hear the sound, I did to when I took the pipe btween the stock muffler and y-pipe. sounded awesome but I was going through a whole tank of gas every week. this fill I tried to keep it under 2000 at all times and I only went through a 1/4 tank instead of the normal 1/2

 

I didnt notice a bit from stock, straight pipes, then to magnaflow muffler. If anything its lower since stock. Granted im always getting on it.