Anyone out there with a new 6 speed transmission have any information about the recommended shift rpm's for the 600 engine? In the short time I have been driving it seems like the optimal rpm's for each gear is 2000-2100 rpm's. Keep in mind this is with a empty truck and no trailer. Anything above 2100 rpm's it seems that the turbo spools faster but you don't get much speed advantage out of the extra rpm's. I'm sure with some weight in the back or a trailer the rpm shift points would change but for now I am running with a unloaded truck. Any information would be greatful.