The wife and I just got back from driving the Cal coast HWY 1 to Sonoma then back down Hwy 5 and the I-10 and averaged 74 mph on the way home with 16.5 mpg. Over 1500 miles round trip back to AZ.
The LR3 performs very well at highway speeds and is extremely stable. I was pleasantly suprised on the switchbacks of Hwy 1 and the Pirelli Scorpion ATR's worked great.
I race motorcycles here in CCS in AZ and was impressed with the LR3 on the corners for being such a heavy vehicle. My LR3 is a 06 HSE.
Get one you will not be dissapointed.
Oh and I can only imagine that the LR4 will exceed the LR3's performance.