i cleaned my egr valve with a tooth brush. was pretty nasty. ran smoother afterwards. i also sprayed a bit of seafoam in the manifold were it bolts to the motor. that made some smoke. well today i was at 175 at half tank again. what i posted was from last weeks fill up.
i took it off,not apart. pushed in the spring and cleaned around it with the brush. was jammed full of carbon. While we find your parts, please enter your ZIP Code at PartsAmerica.com on my old truck it wasnt so easy, but it was cheap to replace. like 30 compared to almost 200.
Gas here is at like 3.49 at Walmart which all the Walmarts here are usually cheepest gas in the city..... So my car don't have a carburator, so I put the seafoam in my gas tank, where else is there that I can put some Seafoam in, I notice my car is fat but seemed to lightin up on eatin all the gas.
topped it off before gas goes up. average was 19.4 mpg. still way better than 17.3 city i was getting. not driving helps too.