Try running your tire air pressure at 39 instead of the factory recomended 29 lbs. Also, try using Lucas brand gas treatment, the silly stuff actually works and does pay for itself. Yeah, get rid of the roof rack, you can actually here the difference.Switch to Mobil 1, this works too, if not already using synthetic oil. We've got two '99's, 90K plus and we routinely get 19 plus mpg with these simple tricks.