I have a 2004 Tacoma Doublecab TRD that when driven mildly agressive gives me about 18 mpg. Lately I've had to drive much further to work, about 50/50 highway city miles. I've found I can actually get somewhere between 21 to
22 mpg if I just take it easy and accelerate slowly and coast earlier when you know you have to stop or slow down. It's hard though when you are in competitive traffic that if there's room inbetween you and the car in front of you some A$$hole has to squeeze in to make his turn.