Diesil is a band-aid fix, better MPG on the Liberty but the cost isnt much lower (2.77 compared to 2.99) both of which are getting higher. My plan, ease up on the accelorator, bike the two miles to work (which isn't something everyone can do) and I might remove the air dam to improve MPG. I'm holding out for fuel cells, give it time, they are comming. My current costs are about $40 a week if I go somewhere on the weekend. To me, its worth the enjoyment I get from driving it.