I currently have a 2004 V8 sport. Im getting about 16 MPG average. I know I have a bad O2 sensor and 2 cracked exhaust manifolds. I want to get a truck and have been looking at 4door Tacomas but I REALLY like the Crewmax Tundras. Can anyone shed any light on what I would be looking at for mileage with the 5.7L Crewmax.