Low gas milage after stage 2

[ChefMKV]

After u went stage 2 I've noticed my gas milage go down to about 26-28mpg average. I talked to my shop about it and he says it's moat def probobally because I have a catless downpipe. Makes sense. What do u all think? And others that are on stage 2 that have downpipes with cats what kind of mpgs do you get? Your responses will determine if I'm gonna have a cat welded on and then get a hpfp.

 

[GTIMKV20]

I get 25-27 when it's below 30 degrees out.. 40 degrees and up my stage II mileage goes back to 29-32 depending on driving habits.

 

[donjuan1jr]

I drive alot of highway driving, maybe like 85% highway with the rest city...im not easy on the gas for the most part and shift 3k...i have apr stage 2 and 2.5"awe catted dp...

i get about 29in the winter and like 32-31 the rest of the time. I dont think the cat could affect your gas mileage that much. It could be alot of other things, especially winter gas.

 

[iwannagofast]

Same problem here. I have a 42DD catted DP and am averaging about 2 mpg less since I went stage 2. When driving all highway miles, I used to be able to get around 30 or 31mpg, now its 28 or 29mpg. I don't think your dp has anything to do with it.

 

[BillyBob]

It's a lotta driving habit. Car eat smore gas after the tune in the 3K+ range.
Changed my driving habits to be in 4th gear in the 30-35 MPH range local driving, and my mileage is around 21.
65-70MPH varies from 29-31. Colder temps yeild lower results. i calso have a twintercooler, and denser charges tell the engine to dump more gas...

 

[nhbubba]

You on summer gas yet? I've seen like a 2-3MPG bump in just the last few weeks.

 

[WestCoastDub]

Same problem here. I have a 42DD catted DP and am averaging about 2 mpg less since I went stage 2. When driving all highway miles, I used to be able to get around 30 or 31mpg, now its 28 or 29mpg. I don't think your dp has anything to do with it.

I just went stage 2 last week and I've noticed exactly the same thing. I also have the 42DD catted downpipe with res and I did a long highway drive yesterday and saw my mileage slip to 28-29 from 31-32. So is it just because the more aggressive tune uses more gas? At stage 1 I found a slight increase in mileage.

 

[langer]

Yup, noticed a 2-3 mpg loss on my commute today. Flashed to stage 2 over the weekend (from stock). I attribute it to my heavier foot with the new flash, but I was pretty conservative on the drive home and was still about 3 mpg less than usual...same speeds as always. Ah well, I'll see how it averages out. I'm not overly concerned, pay to play.

PS 42dd catted DP and bsh intake

 

[ssunnylee24]

You've been boostin' too much lately..lol

 

[SpoonGTi]

i don't know if it's some fluke but my gas mileage went up after going stage 1 and 2. I was getting bad mileage when I was stock.

 

[Tpass]

my shop that flashed me to stg II seemed to think it would increase my mileage but it may have been bullshit marketing. Haven't really checked it to be honest.