I have a 2007 Tacoma 4x4 with the 2.7 motor in it and a 5 speed. It does not seem to get the gas mileage I use to. Are there somethings I can check to see if I can improve my mileage truck runs like a champ. It has 130k on it. I want to drive it till I can't anymore. Any suggestions I would appreciate. Thanks!