The 40XR only weighs 500lb less than the 45XR...and early 40s carry nearly 700lbs less fuel than the 45 or current 40XRs.
http://www.aviationweek.com/aw/gene...009_p0128-168049.xml&headline=Learjet+40/40XR
The "new" 40XRs with extended range was made for exactly one reason - stay competitive with the CJ4 in performance. The CJ4 makes 2002nm with 2 pilots and 1000lb payload at HSC; the 40XR makes 1991nm with 4 pax (I
think the typical marketing 170lb passenger, not sure) at 0.75M LRC...which is a fuzz slower than the CJ4's HSC of 0.77M.
Also - the 40 lacks the
biggest thing the 45 series offers over the CJ series IMO: an APU!
I think a BR-modded used 40 represents great value, but operationally an XR or BR-modded aircraft has similar range to a CJ3 for probably 25-40% higher DOC. It does, like the 45, have superior payload capability over similar-range Citations with the 21,000lb MTOW STC.
Its REALLY too bad Bombardier hasn't put a PL21 cockpit in these things yet...