I've read that the Prelude 2.2 Si VTEC should give 22/26mpg city/highway. I'm getting more like 20mpg for 85% highway. I vtec a bit but not excessively. I replace oil & air filters regularly but don't do much else. Any suggestions on what could be causing this? Hot idle is sometimes a bit rough and when I drop the revs at a red light I'm always afraid it's gonna stall. Cheers, Prelude owner who spends too much on fuel.