how can i get alittle bite better gas mileage ? i already have a k&n air filter, gained me 3 mpg. and its is true that in 20 degree weather your car will take more gas to get up to speed then 60-70 degree weather ? thanks for the help!

In colder weather the air is more dense and requires a bit more fuel, but nothing that should impact your gas mileage too much. As for things you can try to improve your gas mileage... here is a thread with ideas: http://www.carforums.net/showthread.php?t=134&highlight=gas+mileage