RAM 2500 6.4 Hemi 3.73 gears, Looking for Opinions

Probably a very good combo. I went diesel but I drove the 6.4 too and gave it serious consideration. The deactivation seems to give the Ram an advantage over the Ford or Chevy in real world MPGs. I wouldn't expect great things going 80 on the freeway, though - even in my truck there's a substantial drop in mileage from a 70 mph cruise to an 80 mph cruise. I'd expect an even bigger drop in a gas truck with shorter gearing.