2112 wrote:
I think somewhere there has to be a balance...between cubic capacity....HP/torque being produced...purpose of the HP/torque.....general durability and long term longevity of certain high stress components. In this case the...high rpm, bearing cooling, capacity of the turbocharger(s).
I towed 10,000 lbs over 700 miles this weekend and the only time my rpm went higher than 2300 rpm was while entering the freeway. It rolls 65 mph at 1800 rpm, rarely coming out of OD. This helps on engine longevity. Transmission I'm not so sure.
I towed 1200 miles this weekend. Tow vehicle was a 2014 Silverado Double Cab 5.3 V8 4x4 LTZ. 600 miles with empty 2400lb cargo trailer, 600 miles with loaded (4400lb) cargo trailer. My average mpg for the trip was 16.0 mpg. I discovered that tow haul still allows the truck to go into V4 mode. I could tow 2-lane highways in V4 mode at 55mph after getting up to speed. I towed the Mackinac Bridge in V4 mode up and down (at 30 mph).
I then proceeded to get 23 mpg for my Monday and Tuesday commute.
