Help! I have a 1998 Xedos 9 2.5 auto, which is averaging 10 - 12 mpg.. and I'm about to start towing a 1/2 ton trailer.. How do I check / adjust the mpg? I just changed the plugs and they were a little white (lean?..) but otherwise ok. I can't carry on draing the worlds fossil fuel resources - not to mention my pocket - like this!.. Any advice gratefully accepted. :crying: