You guys are doing it wrong. All of the diesel guys lie about their mileage. It goes sort of like this:
"I am pulling a 40 foot 5th Wheel that weighs 15K pounds with (Insert Ford/Chevy/Dodge) I get 18mpg when I pull at 85mph. If I pull it at 90mph my mileage drops a little."
Sadly, both of my GMC Duramax engines have consistently averaged just over 10 mpg pulling that 37 foot toy hauler. And I rarely pull faster than 65 mph. I start worrying about the tires on the camper above 65mph in the summer heat.
Many years ago I was headed to the coast towing a 22 foot Pathfinder behind my 2500HD Duramax. I was behind some sort of SUV towing a 27 foot Donzi with twin 225 Mercurys. He would pull away from stop signs and red lights with Authority but then would barely do the speed limit. When I finally was able to find a straight to pass him it was a Porsche Cayenne Turbo. He was badly overloaded but he could sure accelerate!Pterodactyl wrote: ↑Tue Aug 18, 2020 10:27 pm Sorta related.... today we passed a guy getting a performance award on HWY 20 in Idaho, 20-30 miles south of Yellowstone. He was driving a Porsche Cayenne that had an R1200GS in a cargo carrier basket mounted in a receiver on the rear end. I don’t know if he was speeding or the LEO wanted to see why his front end was bouncing down the highway.