Gas Milage

[Tuner923]

Some things that cause bad fuel mileage: Air filter, tire pressure, rims/tire size, alignment, fuel filter, spark plugs/wires, transmission drag, changes to exterior aerodynamics(to include rain guards), cargo, faulty O2 sensor(s), clogged cat, too large/small diameter aftermarket exhaust, faulty engine coolant sensor, maf sensor, combustion blow-by


list from the top of my head if i think of more i'll post

 

[dsans11]

Im personally only getting 22mpg with my 07 LT2 automatic cobalt coupe and I have about 53k miles on it.

 

[BankDude]

Im personally only getting 22mpg with my 07 LT2 automatic cobalt coupe and I have about 53k miles on it.

You're doing something wrong

 

[dsans11]

Im stumped myself. It has a clean air filter, tires at 30 psi, oil is at 85% life, I have it shift at 3000rpm (sometimes at 3500rpm but usually 3000rpm). The transmission fluid was changed at 35k and coolant flushed and fuel system pressure cleaned at 45k. I changed out the fuel filter at about 40k. I dont know what else I can do.

 

[BankDude]

fuel filter/injector cleaner are both wonderful things that will help you out immensely

 

[dsans11]

Something. I really want to get better mileage before these $5 a gallon prices hit like they are saying. I really hate not being able to drive to chicago anymore like I used to do all the time. I live in central illinois (peoria) and its about 180 miles to chicago one way.

 

[donnkesterjr]

I have it shift at 3000rpm (sometimes at 3500rpm but usually 3000rpm).

This.

The only time I reach 3000rpm is:

1) Up a decently steep hill
2) I HAVE to in order to get on the interstate safely (i.e. early morning traffic, you gotta get in when you can)
3) it's an emergency

I normally ease on the gas & the car will shift at 2000 to 25000 RPM. It also depends on your driving conditions. If you do more street driving than highway driving, your gas mileage will go down. If you have to stop every tenth of a mile for a redlight, that's a major drag on your MPGs.

 

[Cobalt_07_LT_Chris]

i got almost 76k miles on my stock, automatic cobalt 07 LT, and i drive approximately 60 miles monday through thursday. I make 29 mpg with a full size spare tire, and about 100 pounds of tools for my class in the trunk. i barely hit the 3000 rpm. so my suggestion is to not drive over 3000 rpm. also, check the things tuner923 mentioned. that may solve your problem.

 

[BankDude]

i shift at 6500... is that bad?

 

[Cobalt714]

i shift at 6500... is that bad?

no that's perfectly fine lol, i dont even bother shifting im always on the freeway in first gear

shifting is overrated