Bad gas mileage with new exhaust on SS LS3

[Albion]

Sounds about right to me.As long as your not driving like a 'Jessie', i've come to not expect much more in,short trip and town driving.
Best MPG is arrived at using 'cruise',that does'nt suit me as no roads are longer than about 10 miles in the U.K.!

[KeepItGreasey]

Originally Posted by Mr_Draco

Actually getting worse gas mileage is fairly common. Not because of the mods and the tune but because humans subconsciously change their driving habits without realizing it after during such mods.

love that new exhaust sound? love the increased performance? drive with a heavier foot?

[montej23]

what is your average MPG overall ?

[BigRed585Lbs]

If you're gonna dance to the music, you gotta pay the band!
Don't worry about it; some people are paying $1 for a bottle of water! At least, you're getting to hear something, and gettin' there faster.

[JDP Motorsports]

Originally Posted by Larz29

So I just installed a flowmaster cat back exhaust this past weekend, then reflashed my diablosport predator 93 tune. I noticed a noticable performance gain, but my gas mileage tanked.. Before the exhaust i was averaging 16.5 mpg with all in town driving, and now by driving very very nice I'm barely getting 15 mpg.

Seriously everyone I talked to said my mileage would improve with a tune and aftermarket exhaust, and CAI... Not the case with me! LOL.

Do I need a custom tune? Any ideas? Thoughts?

Easy on the right foot!