It's been a week since I performed the airbox mod and put in a Spectre Cone Filter. Fuel mileage improved to 29.2 at an average speed of 52 mph. Granted I did drive about 700 miles this week. Not bad for an SS/SC.

 

i hear you.. i am at 28.8 mpg .. but i am babying it and in trafic. i try to keep it right at -10psi boost or under because when you get on it and get max boost you can see the gas needle go down.

 

I run about 80 mph and bang out 100+ at least 4 times during my trip each day. Can't help myself.

 

I'm getting about 27MPG on my daily city slog.

On a sad note... watch it with these new Spectre filters. Mine popped a P0171 on me yesterday. I cleared it this afternoon (pulled the neg battery cable). I've gotta drive it some tomorrow to see if it comes back.

 

No CEL yet but I do plan on getting the AEM filter eventually since it is the right size for the intake.

 

Yeah, I think I get 2-3 mpg under WOT, not good. But I get ~28 mpg average

 

These are all good mpg figures. I wouldn't have fared as well if I had bought a GTO like I wanted.

 

I don't know what I am doing but a hammer 80-85mph up and down the GSP for a total of 170 miles round trip a day and I am averaging a solid 31.2mpg totally stock on 93 octane pump juice... I have dipped to 30.5 when caught in heavy traffic but once free I start climbing right back to 31...

 

It makes me cry when I read about how SS/SC's get better millage than I do...

 

if you guys keep it at about 2.2k rpm thats the sweet spot. However Please be carefull you will cause the clutch to start to overheat or something. I just had a problem with this were my clutch was slipping bad etc. took it to the dealer and found its because i have been shifting early etc

 

i question the guage on the cobalts...expecially after the stage 2 install.


i'm guessing they are...generous.

 

Agreed. After ST2 install, I went from 10.6L per 100km to 10.2L.........
It makes me feel better if nothing else.

 

my weekly mpg average is usually around 29-32mpg depending on how i drive that week. its a 82 mile a day round trip that is a combo of city and highway.

on a side note, i run 93 octane and some times after i fill up it runs better than it did the time before or it runs worse, so i bought a bottle of lucas octane booster. and we are talking night and day difference in performance. so for 3 bucks a gallon they sell some seriously shitty gas here....

 

So you are running an '07 with just a stage 2 kit and a stage 3 pulley... You have not changed the intake or exhaust and you still manage 29-32mpg? I might have to reconsider the stage 2...

 

29 is great! that's what i average in my 2.2. highway i get just under 40 if i baby it, but average is right around 29.

 

I have a half and half sort of drive (city and highway i mean) and I hit 35.6mpg today. One of the reasons this puppy is staying stock.

 

my mileage actually went up a about 3mpg just putting the aem dryflow on. the car gets killer mileage. my highway mileage is about 35mpg cruising at 65.

 

Thats where i try to keep it and i can stay around 32-37mpg. But my daily average is around 26mpg

 

Mine went up by 3mpg when I started only filling the tank up half way (weight conservation).