I've noticed an enduring thread in this group regarding fuel economy. I might be crazy but I just had this thing installed on my XC 70 yesterday and I'm testing it out to see what difference it makes. This was tested on NBC local channel here in Las Vegas a few months ago and it seemed to make a difference. On my way home up the 15 it seemed to make a huge difference. The idle is smoother and acceleration is improved to a great extent. On cold startup in the morning the engine starts on the first "click". Believe me, I have no connection with this company whatsoever, but I'll try anything once...well almost anything, so Gay guys don't have to contact me. Check it out. Jim Snyder on channel 3 here in Las Vegas had it installed on a sort of worn out Taurus. He seems to have liked the results over a test period of several hundred miles, and the results seem to have held up to the claims of the company. Anyway...here it is. [URL]http://www.aquatune.com[/URL]