I took it out for it's first run on the new rubber today. Feeling kinda nervous about it, so I dropped by my local Les Schwab tire center and had them double check the wheel torque and air pressure (450 ft/lbs, 90 psi). All okay, so I headed out on the highway. The ride is a little bumpy when you roll off from a stop, but after about 10 mph it smooths right out. It felt so good, I jumped on the freeway to run it up to speed. I ran it up to 75 mph smooth as can be and tracking dead-on straight. I only held that speed for a minute to see if I could do it, and then dropped down to about 60-65 mph. At 75 mph (according to my GPS) the tach was at 2000 rpm and the truck's speedo was indicating 57-59 (it bounces).
At a more comfortable 65 mph the rpm was around 1750-1800 rpm, and the speedo indicating 45 mph.
This truck is so easy to drive, you can take your hands off the wheel and steer with your knees! The bigger tires were a great improvement - plus I get more looks then ever before! This thing really REALLY sticks out on the road!