Your getting some good advice here, think you will regret selling it. Looks like you've spent a fair amount $$ on mods to your X, unless you find the right buyer, I doubt you would get a fraction of it back in a sale. The other consideration for me is comfort and safety, depending on what you would replace the X with, I wouldn't be willing to give up safety for a few extra MPG's. Then there is the fun factor, I love driving my X, that in itself is worth about 10 more MPG. Good luck...