in the warmer months i get 20-22mpg without a problem.

colder months...14mpg. dealer checked it out, said its fine, no codes

 

MY 05 GT/stick usually gets 20-22 also (mixed highway/city) . . . . I live in California now . . . . .. I don't think my mileage was much worse in winter (when I lived in Michigan) . . .. . MAYBE down to 19-21 . . .. . but I don't think it was 14 . . .. .. .are you doing donuts in the parking lot???

 

with the winter blend fuel I lose mpg's. Also if your letting your car warm up on those cold mornings your mpg's will suffer more. Where are you located?

 

My truck's mpg has dropped about 15% in the last month or so.. I'm guessing it's the winter fuels around here, sense she's running great.

No clue on the GT as I really don't drive her enough to get a honest read on mpg.

 

Tires also can lose pressure in the colder months. Check your tire pressure which can also affect mileage.

 

All things suggested so far are true. It's pretty normal to lose some mileage during the winter months. One of the big culprits is letting your car warm up. That burns fuel that isn't used on anything.

Not only that, it's not really good for the engine either. Your engine should be brought to normal operating temperatures as quickly as possible to avoid carbon deposits which in time could create an octane tolerance.

Keeping your vehicle clean and free of snow/ice buildup on moving parts (the wheels) will help as well.

 

Also, if you normally engage the parking brake, then it may not be fully releasing in the colder temps. One way to tell is to feel both back wheels after driving a mile or so. One or both of them will feel warm/hot if it's sticking.

 

It's is the winter blend fuels. I lose 2-3 MPG on every car I own this time of the year.

 

tire spin in the snow will cause a drop also

 

What is this winter blend deal? I wasn't aware that the fuel composition was different. I assumed it was becuase the car runs richer when its cold as to bring the temperature up to normal faster, thus burning more fuel.

 

ummm no

start and roll, to hell with warming anything up

Michigan

yea, maybe one or two, but not 7. filled with nitrogen, TPMS also. but its been checked

dont drive it in the snow. so thats out.

mileage in my 2000 5.0 AWD mountaineer doesnt change from summer to winter. i never check the "air pressure" and beat the **** out of it more in the winter than the summer, flat pedal at every light or stop sign in the winter. 18mpg no matter what.

so where are all the theorists now?

 

Go with what I said, haha. Your mountaineer may be a freak of nature!!!

 

Are you asking for help or just trying to prove people wrong? I could easily be a combination of factors.

 

In Arizona the winter blend fuel has 10% ethanol in it. In the summer it is straight gas. Also in cold weather the air is more dense so more fuel is injected and mileage goes down. I lose about 2 mpg in the winter.

 

Did you check if your car's rear brakes are dragging?