I have an 06 with a little over 93k on it. For the past few weeks we smell a strong gas smell when we start it up. I just changed the plugs a couple weeks ago to try and help mpg. It was getting about 11.5 and now is almost down to 11. Of course this is not accurate but it should be pretty close. I'm not sure if the mpgs and going down because of running the ac all the time or something more serious. Can anyone help or has had similar experience?