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I am using Amsoil 0W-40 in my 2016 2500, 6.4 Hemi and it seems to performs well. I tow a 6700lb. 30' travel trailer on average once a moth, usually 600 - 700 miles round trip with no issues. The rest of the time normal daily driver routes. www.ddiultimatelubes.myamsoil.com
My best has been 18MPG average from Richmond. VA to Orlando, FLA - running 70 with cruise on, not towing, but lightly loaded inside with luggage, etc. for my wife and I for 1 week.
Just came
Just got back Sunday from a trip, Richmond, VA to Gettysburg, PA. 2016 RAM 2500, 6.4L with 3.73 gears. I got about 8mpg on the way to Gettysburg using cruise control and no tow/haul, running 60mph - 65mph, got about 9.2 mpg on the way back same speed, no tow/haul and no cruise...
Put on Weathertech window vents - look great and work perfectly. Auto up windows work perfectly, no getting hung on the vents and then going half-way back down like I had on a F-150 I used to own. Love them!
I bought my 2016 2500 Big Horn last December with 36,000 +/_ miles on her. Just drove her to Orlando from Richmond, VA for a 10 day vacation, now has right at 50,000 miles on the odometer. I love the truck - great for a road trip, easy enough for around town driving, and the mileage isn't...
I am getting about 15 - 16 mpg everyday driving, with the 6-speed tranny (I think). Bought the truck used and can't look op my VIN on the RAM website to see what tranny, gears, etc. it has. About 18 - 19 on long highway stretches.