i have a 99 2.5l, ive had it for 2 years and only put 20k on it since ive bought it. when i first got the truck i would get 20mpg in the city, and 25-35mpg on the hwy, currently the truck has 200k on it and is only 15mpg hwy, i had an egr problem and i fixed it, no change, i did plugs and wires...