I've started driving in the city for the past couple of months and l know you get like 23mpg city driving.But l think I've been getting more like 20mpg.Does anyone else have the same problem???

cold weather drops fuel economy

If you're in an area where it is colder this time of year, it is because it is colder outside.
People tend to let their cars warm up longer (if the car is running, but not moving, you're getting 0 mpg) when it is cold out, and if there is snow on the ground, that added rolling resistance will decrease gas mileage. Also, make sure your tires are up to the proper air pressure. Cold weather make the air pressure in your tires drop.

Cold weather definately makes a difference. Your mpg will also decrease if your a lead foot ;)

Mileage is dependent on how you drive.

20mpg isnt that horrible. have u completely filled up ur tank and then drove till the gas light came on and then figured ur gas mileage from there? city vs highway u will burn more in the city