Just had a 100 mile trip today and only averaged 22 mpg. Didn't even go over 1600 rpms really for the whole trip. 55 mph on cruise control. Now I know the guy before me really didn't take good care of the car, and I know I need an oil change. Aside from that I'm going to change my fuel filter, and possibly spark plugs. Well I will for when I get a smaller pulley. Anything else you guys can think of for a small tune up to get her running the way she's supposed to again with better mpg? Tires all had good air pressure in them.