I have an 06 ss/sc And I don't the exact mileage I'm getting but it has to be around 13-15 mpg I use almost a quarter tank going on a 45min drive all hwy, I cleaned the throttle body and changed the air filter but it still did not help is there anything else that can be causing the problem

 

Plugs are another thing to look at

 

WOT will do that ... Are you staying out of boost? We should all be over 30 mpg with a tender foot. Maybe you have a leak? Do you smell gas anywhere?

 

Yea I baby the hell out of it just to see if that's the reason, but no I don't smell any gas anywhere

 

Yea that's what I'm gonna check out layer today

 

O2 sensor could be shot.

 

But wouldn't I be getting an engine code it was out

 

What is you mpg?

 

How many miles/kms to a tank? Im getting 21 mpg in a NA 2.2 cobalt
Which is 450 kms / 280 miles to a tank

 

I get around 340 to a tank if I'm good about it in my 2.2

 

Check your tire pressure.

and are you going by the DIC, or actually doing the math? How much of that 45 minute drive is top and go?

 

I'm going by the econ on the dash it saids 8.2L/100km and by how much I see the hand move on a drive, I use a quarter tank maken a 60 mile trip, and its all hwy exp for about 2 miles getting to the hwy

 

I get it, it's highway. I've seen the highway in Charlotte enough to have asked how much is stop and go for a reason.

Next time you gas up do the math and get a real number. Then we can find out how far off it really is. It would be interesting to know what speeds your doing on this highway drive too.

Thee check the usuals, plugs, air filter, tire pressures. Wrong tire size can make a big difference too.

 

probably this.

 

Not necessarily. It could just be reading completely wrong because its shot and therefore causing a rich mixture, using too much gas.

 

there are lots of things it could be, o2 sensor, how cold is it outside? colder it is the less ull get. try different Gas station, iv seen my old car loose 100 kms to a tank cause of the crap gas where i filled up, is ur oil running low? if ur low on oil ur engine will work harder using more gas. check the easy stuff like that first.

 

mine stays steady around 9.2-9.5 cuz stop and go town driving.
you still never said how many kms/miles you get to a fill up..?

and if your dic says 8.2 thats about 28 mpg.