QuickSilver_SS

I am wondering what people are getting for millage on there dic / 100km. I live in Canada. And my car is an 09 SS/TC with GMS1. According to my dic I am seeing about 8.5L/100km right now. Over the winter it was up around 9.8L-10.1L/100km. But I reset it a few weeks ago when the weather got a bit warmer and nicer. And it seems like it is going to settle around 8.5L-8.8L/100km range. I was wondering what other LNF's are seeing ? I will usually get about 500km to a tank of supreme if I drive fairly easy and don't go wot at all.

09outlander

My average is 9.2, could be better but I don't do the speed limit and I lay on the gas a lot.

footballplaya3k

iTrader: (1)

24-26MPG 'Merican.

r3v07ut10n

iTrader: (2)

Im at 10.* / 100 at the moment, only 94 octane, with meth spraying @ 10psi+, with 445 gears. ~23MPG. LMAO lately though its sucking down much faster, and only going to get worse once i get retuned for more meth and to lose my boost ramp tune.

QuickSilver_SS

It seems to have settled at about 8.5L-8.6L/100km. Which is 27.5-27.7 MPG. Does that seem about right ?

alerosaint

I got 25mpg on the way to work with mixed driving highway and street, a lil boost and sitting at the drive through

umrdyldo

iTrader: (1)

I am on a no boost diet for the last couple days and I'm getting 32.5 this week to work and back. 40 mile round trip daily.

Winter is usually 25 mpg and summer is usually 27-28 mpg.

Before my intake valves were cleaned I saw 23mpg in the winter.

footballplaya3k

iTrader: (1)

I need to clean my damn valves....

umrdyldo

iTrader: (1)

Well I saw several people report that it improved gas mileage and didn't quite believe it.

But it sure seems to be a lot better.

QuickSilver_SS

I wonder why it actually helps with fuel mileage ? Did you notice any difference in performance at all ? Did the car seem to gain any power back and or pull any harder? Or just an increase in fuel mileage.

umrdyldo

iTrader: (1)

Between cleaning the throttle body, cleaning the intake side of the head and cleaning the valves, you should see a decent increase in airlow.

I really wish I hide dynoed before and after. It's noticeable but not crazy

QuickSilver_SS

I am now seeing 7.0L-7.4L/100km. ( 32.5 mpg approx ). That is way better then the 8.5Lish/100km. ( 27 mpg ) . Just from cleaning my intake valves.

umrdyldo

iTrader: (1)

I wonder if anyone has done a road trip tune. At 60-70mph the LNF Cobalt can get mid 30s if you hypermill a bit.

StevoElSupremo

I usually average around 8-9(more lower 9's) If I'm being super duper careful I can get mid high 5's. But yeah it's tough to get decent mileage in this car for....obvious reasons...God with that muffler delete and Intake it's just too much fun to wring out!

Only mod is K&N Typhoon

Terminator2

I used to get 30-31 MPG normally. 28 MPG if I did 4-5 rolling burnouts a day driving to and from work.

alerosaint

I was getting 32 .5 miles per gallonuntil I got North Dakota now I am getting 31

09outlander

Since I had my valves cleaned last week I'm down to 8.2-8.3 L/100KM or about 27.7-27.9 MPG.

06 GM CobaltSS

Where and how do you guys get the intake valves cleaned and who would you recommend? Seafoam? Walnuts?

footballplaya3k

iTrader: (1)

Powell is the man to do the work if at all possible.

umrdyldo

iTrader: (1)

https://www.cobaltss.net/forums/how-...emoval-304188/

DIY is about $150 or less.

alerosaint

Got this yesterday


Almost 300 left just a lil above half


I decided to fill up just before I reached by my buddies house

umrdyldo

iTrader: (1)

Well if you are going 60 then ya. It's the 75mph that's killer.

sc4door

iTrader: (8)

I do mostly in town and country road driving and I get about 22 mpg if I stay outta boost as much as I can. And for anyone asking about cleaning valves, when I did mine, I just used brake cleaner, small wire brushes, a set of picks, and a shop vac and mine came out just as well as any of these that have spent money on special cleaners and blasters. I just filled up the closed ports with brake clean, let it soak for a few minutes, vacuum it out and then use the picks and brushes to scrape all the gunk out. Just kept doing that til everything was clean. I run meth and I'm kinda curious as to how well it helps keep the valves clean

user 72239

iTrader: (4)

I am getting about 20 to 21 mpg on full E85 city driving.

ECaulk

iTrader: (6)

I think with some adjustments to the midrange midload cam overlap we could bump you into 24-26mpg on e85