Only drove 250 miles today, but it was a long 250 from the coast in Oregon over into Cali. Had several steep long climbs along the way that were slowed down due to single ln construction. Everything performed great. Whenever the water temp would reach 219 the blower fan would come on and it would immediately cool down. Tranny temp got to it's highest temps yet to date. Mostly stayed around 163-165, but after outdoor temps shot up to mid 90s and we were pulling the hills up and down 4000' elevation, it hovered around 172. Jake brake worked great, held me back perfectly, until someone slowed down in front of me. Think i might be figuring out were my rattle is when the Jake kicks on. I think its in the plastic bubble beneighth the rear view mirror. Couple hundred more tomorrow. This truck is great for traveling in