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Welcome to the site david.
I too am from upstate NY - winter kills mpg's, so don't feel bad if you can't improve this time of year. Keep practicing technique, check the odo vs mile markers, pump the tires up to max sidewall, and wait for spring.
I once calculated the air is something like 10% heavier at 20* vs at 80*, if I'm remembering the numbers right. I believe the formula for drag is proportional to the fluid/air density... so a car has 10% more drag at 20* than a nice summer day, all else being equal (ignoring longer warmup times, stiff cold tires, and oil/grease/lubes stiff after sitting overnight).
As the weather warms up you will see improvement. Also remember the 10% ethanol now in gas is likely hurting your mpg's. Good luck!
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