City driving is the worst impact on mileage. Since snow impacts traction, and colder weather impacts fuel mixture and warm up times, its a recipe for bad numbers. If you want o really see if you're getting the right numbers, take a highway trip and calculate just that portion and see where you are sitting compared to the ratings.
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'09 Corolla CE Enhanced Auto
TRD Springs/Sway/Xrs FSB by Yamaha
Lifetime : 6.121L/100km(38.714mpgUS)
Maximum: 5.082L/100km(46.287mpgUS)
(manually calculated) (original unflashed factory ECM code)
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