It has been some months since I've been to this site. I see this conversation is still going on. I added the volant intake and Calmini exhaust to my X. Reset the computer. I may have boosted my MPG 1 mile, if that. I think it is a waste of money to try anything to give the X better mileage. Live with it or sell it. I think gas prices are going to keep rising. I don't have the 05 model, so I have this anemic V6 that gets bad mileage. I get just about as good mileage with my 96 Dodge full size pickup, V8, running the crap out of it. Oh well, live and learn.