My MPG is pretty good, 24-26 highway and 14-16 in town. I put in new Bosch 4-hole injectors in three months ago and they really helped. Idle did improve a bit, but I think I have a more serious issue! You can sometimes smell burnt coolant inside the cab. I will test the sensors, but really need to find where is the coolant going. The oil looks ok, not milky or bubbly. Wondering if my temp sensor is faulty with the fluctuating temp, sure went up to 260 fast! I yi yi!