I was trying to not get into this but I guess I have to:
I see it every year when we go camping, every year. People pulling a camper that don't even weigh 5000 lbs with a CTD, DuraMax, Ford diesel w/900 ft lbs. I know WHY they do it, I just think it is BS that they HAVE to. Reason: The gas engine trucks are simply not geared for HD work. Not in the axles & not in the transmission gears. Which is part of the reason I ordered a Power Wagon with the manual transmission. I know bad mpgs are the result. But remember----not too long ago, we pulled a 6000 lb+ camper, with our station wagon !!! Yes, thats right, a car. It never overheated or had the transmission go out.
We bought our 10,500 lb Toy Hauler in 2004. We bought a 2004 Ram 2500 QC 4x4 w/Hemi/545RFE/4.10 axles/tow pkg. It absolutely SUCKED BIG TIME for pulling that camper. It would either be screaming in 2nd or lugging in 3rd & CONSTANTLY be shifting back & forth between them. My F-I-Law's 2004 Chevy w/6L/auto/4.10's did the exact same thing. I had to go from a 12 row factory, to a 24 row trans oil cooler & an engine oil cooler, just to keep it from self destructing from heat. It got the same or less mpg towing as my PW does with the way lower gears. Same engine (345hp) as the 04' but the 4.56's & the much lower transmission gears made towing the Toy Hauler easy peasy. If the newer gas trucks had transmissions & axles were really made for HD work, you wouldn't see people pulling 3-5000 lb campers with diesels. Don't get me wrong, I love diesels, but not everybody that has one wants one. I meet them every year when camping. They buy them because the diesels HUGE torque makes up for the lack of proper transmission & axle ratios. They do not upshift/downshift all the time like the gas engines trying to do the same work. And therefore make the driver's experience towing, a whole lot less eventful. The conversation usually starts because they see my engine block heater plug on the front of the PW & ask, "how do you like your diesel for towing ?"
The more expensive fuel gets, the more diesels make sense. They are simply more efficient than a gas engine. But it seems here in the USA, Companies want you to pay up front for any type of savings you MIGHT get from their product. Which makes it a whole lot harder for people to get into the "save fuel, electricity, tree's, etc" mindset. It's like they don't want you to, because they throw every obstacle in your way. Yet they complain about how wasteful us consumers are ?
Also, just read where the Chevy Cruz diesel gets 54 mpg highway & beat out the Toyota Prius for the first time ever. It gets 52 mpg highway. So, maybe, just maybe, the diesels will finally take off good here in the USA, like they are in Europe ?
Maybe when my dealer gets one in, I will see if I can test drive it overnight & bring it home, readjust my hitch to work on that truck & take the camper out for a good test drive. No big hills around my immediate area but the highway is close.
You guys make a lot of good points. I appreciate it, thanks. Keep em coming if you want.