My 99 Toyota Tacoma, Extra Cab, TRD, SR5, automatic with the 3.4 v6. It runs at 2800 rpm @ 60 mph with 32" tires and the ovedrive off. I got 11.8 mpg with a 3200 lb trailer and 10.3 with the 4200 lb Mini Lite. The mini lite is much taller and does not have a aero front like my I-18 did. Pulling hills, it drops down a gear and will run at 55 mph at about 4000 rpm. I have the Toyota ETC (electronically controlled transmission) on. (Fancy words meaning shift points are raised about 500 rpm) The V6 is rated at 190 hp @ 4800 and 220 ft lbs @ 3600. I don't like running along over 65 mph in case of the unexpected. My WD hitch is adjusted so the truck ride height remains within 1" of the unloaded height and I have a friction type sway control. If I had the $$$, I'd go for that new Dodge 1/2T diesel, but I do have a son-in-law with a Dodge 1T Cummins...... and, then again, Toyota has a blower package for the V6!