I have not had my truck off the mountain yet but the people I know who have, said spool and power were noticeably better. I doubt a 5% difference as some have suggested should be the CF in Denver, would be "noticeable". I know Robbie and Allan have been down on the flat lands so let's hear boys.
Truckfest is the week after the Mile High Nationals which I believe is the second weekend in July this year. Bandimere is one of the neatest venues out there. Come a week early and see the big boys http://www.youtube.com/watch?v=cnjr8ppKsS8&mode=related&search=