I fly a LR45, it's a really nice machine. Typically, at 400/410 and ISA you will be burning around 1200 pounds/hour at .78
We regularly fly from Montreal to Wichita and back again. Usually 3.2 to 3.3 hours down and 2.8 to 2.9 hours back. We're pretty much limited to 7 pax at those flight times (depending on your alternate of course).
I enjoy flying the airplane, the XR model is certainly nicer when the temps are on the high side. The wing is fantastic and the brakes are great too, to the point that thrust reversers are almost an afterthought, which is the complete opposite of the 60!
Hope that helps.