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I'm not a big fan of waiting for the engine to warm up. I've always started the car, put the seatbelt on, and then take off. I don't believe that anything more than 30 seconds is of any help. Some disagree.

30-45 degrees will get you lower mileage than 60-70. That and your short trips are probably the reason why your mileage is so poor. I'll bet you will see an improvement when spring gets here.

The site below might give you some additional tips.

Source: http://www.fueleconomy.gov/

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while letting a car warm up as the temp aproaches 0 is a good idea, modern cars warm up fairly quick. My own Jeep has a climate control and even at 0 the fan starts to blow warm air after a few minute. I tell my wife to wait for the fan before driving. At temps above freezing there is no real advantage to letting it get to normal operation temp before driving.

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