Just an update - Well it turns out i had 2 totally dead 02 sensors. I have replaced them and a fuel filter but not sure if it has totally fixed the mileage problem. I could only get 2 of the 4 and am waiting for the other 2 to come in so i can replace them as well. So far CEL is staying off. Best mileage i had with my truck is 27 mpg on long hwy trip. Right now is is getting 19 mpg for shorter trips and cant find a leak anywhere. Hopefully replacing the other 2 will make it just like a new truck. <img src="/forums/images/graemlins/cheers.gif" alt="" />