For you guys that have done the upgrade, and hopefully not much else, how has it impacted your fuel mileage? Not when you are going WOT dusting Mustangs or whatever, but if any of you have done just "normal" driving have you noticed a change in mileage?

I'd really like to do the Stage I, but I'm loving my best of both worlds econobox/highway terror. I'd hate to give it up.

thanks,

 

My mileage seems to be about the same.

 

I gained about .5-1 mpg on my daily driving.

 

I'd have to agree here. Maybe a little more for me.

 

My tune is based off the GMPP tune, I average a hare over 30 on my mostly highway commute with a few ricer pulls per tank. 'Bout the same as the old tune.

 

GMS1 and 100% stock everything else and I avg 3-5 mpg more with GMS1 more power, more mileage, full warranty just get it!!

 

also

 

Getting about 30-40kms more per tank on average. Maybe a couple more mpgs

 

I was getting 28 to 29 mpg before the stage 1 after i've been getting as much as 35 mpg per tank

 

Some of you must not hit WOT much.

I average 26-27mpg with about 75% highway miles. It goes to about 5mpg at WOT so those on ramps are killer.

 

^^^^

Ya ... I get worst mileage because I can't get my foot off the gas pedal ..

 

if it makes you feel better i get 6mpg under normal acceleration in 1st and 2nd gear in my car. WOT in 1st has see 2mpg ima pay attention next time i go WOT

 

 

damn idk how you guys not WOT the **** out of your car, I mean I dont drive my ss much but I floor it constantly. I get 24mpg avg with 1/2 hwy 1/2 city. Like 1/2 my tank was hwy, 1/2 was city. hwy speeds at 80mph and city with lots of hills.

 

I have GMS1 and I am completely stock...

My daily commute is not that far to work, maybe 1/2 mile. So I don't count that. And anywhere else I go, I drive it like its meant to be driven...WOT.

But I recently took a trip to Cali from AZ. I did 80 the whole way (tac at 3k), land was flat, and my instant gas mileage was sitting around 37-40MPG for 90% of the trip.

If you keep it out of Boost, your gas mileage=econobox.

 

Cool, thanks for all the info guys. When the car is only 3,000 pounds, you can really stretch the gas. Awesome that it seems most of you have about the same or slightly better mileage, so its all up to right-foot management.

I've convinced my wife that the SS will save us about $500 a year on gas versus my old car, which is true by the way. I wonder if I can sell the GMS1 on paying for itself... hmmm...

thanks all,

 

~50 mile commute for me, 95% highway. I live on a state road that everyone drives 65 on. Only time I'm in traffic is the last few miles off the tollroad into work hence the 30+ mpg's. I stop once 4 miles from home and the next stop on a good day is the exit.

 

i always avg 24-25mpg i live near hills and backroads and get into it atleast once a day

 

It will when once you get used to it and can restrain yourself but like everyone else has said its very hard to not boost it and use the power and if you start that on a daily basis you can forget added mileage, I have been driving sports cars since I started driving and feel like I have gotten the speed demon mostly out of me by now but I still fall victim to the full boost adrenalin rush once you have it its hard to not use it lol and my 3-5 mpg more is driving like an old lady or workday commute weekend cruising and playing with the car I def lost mpg but the cars faster so its a fair trade off!!

 

I have been averaging 26.1 city and highway mix, i do accelerate hard alot and the balt is still bone stock no upgrades and 2000 miles so far on balt..

 

I do about 1L/100 km more with GMS1 then stock.

I averaged 9L/100km stock and now it's more 10L/100km .

 

This.

 

I seem to be able to get slightly better with the GMS1 than I ever could stock. My average numbers (in Canadian and US units) are:

Highway: ~32MPG (7.5L/100km)
City: ~27.5mpg (8.6L/100km)

It fluctuates up and down and city right now is a LOT of stopping cause I swear every single road is ripped up. I've run 91 and 94 Sunoco (sticking to 94) and the mileage differs very little between the two and the additional cost for 94 is slim to nothing ($1.50/tank more) so I'll stick with it unless there's none around .

 

I just did a long trip from VA to FL and back and I logged my mpg at different speeds. I was way impressed. I have the GMS1 with the airbox mod and k&n filter. I was using cruise control and the A/C was on. FL was awesome for this test cause all the highways were long and flat.

55mph = 42-43mpg
60mph = 40-41mpg
65mph = 38-39mpg
70mph = 36-37mpg
75mph = 31-33mpg
80mph = 28-30mpg

Now if only the cobalt had a sixth gear to lower the rpms a bit for the higher speed I wouldn't be surprised if someone could get over 50mpg.