Winter fuel mileage?

Does fuel mileage normally decrease during the
winter months? I have around 30,000 miles on my
1999 Grand Am GT and fanatically maintain it, using
only 5w-30 Mobil 1 synthetic every 3,000 miles. I
have done some intake and exhaust modifications to
improve performance, which in turn netted me an
increase in mileage to about 23 mpg in town.
However, now that winter has arrived here in
Colorado, my mileage has suddenly gone bye bye.
I'm lucky if I can get 18 mpg in town now. So I
ask again, does gas mileage ordinarally decrease
during winter? Also, they add ethynol to the gas
here in the winter to combat emisions. Does that
decrease mileage? I'm sort of frustrated, but my
car still runs awsome, and hasn't lost power or
driveability at all! I'm stumped.........
winter months? I have around 30,000 miles on my
1999 Grand Am GT and fanatically maintain it, using
only 5w-30 Mobil 1 synthetic every 3,000 miles. I
have done some intake and exhaust modifications to
improve performance, which in turn netted me an
increase in mileage to about 23 mpg in town.
However, now that winter has arrived here in
Colorado, my mileage has suddenly gone bye bye.
I'm lucky if I can get 18 mpg in town now. So I
ask again, does gas mileage ordinarally decrease
during winter? Also, they add ethynol to the gas
here in the winter to combat emisions. Does that
decrease mileage? I'm sort of frustrated, but my
car still runs awsome, and hasn't lost power or
driveability at all! I'm stumped.........
0
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