Just like the main poster said.. I'm in the same boat.. I even had a test done induction service at the stealership and they blew a whole bunch of carbon out, but that didn't do anything to improve the gas mileage.. my next thing i'm going to do is change the spark plugs to make sure they are working right and check the coil packs. If I get 250 or 260 i'll be happy.. I used to get between 270 and 280.. not anymore