Eldon Carl uses 3 gallons to weigh the bikes. Eldon Carl usally states his source for weights, and there is some diffrence from bike to bike.
The KLR weight reduction thread here has good info on the stock KLR weight. http://www.advrider.com/forums/showthread.php?t=172734
The F650 weight from Carl is the advertised BMW # (426) is pretty accurate, and is with full fuel for non US bikes (4 gallons or 17 liters).
I have a theory that the previous model KLR 650 (up to '07) was actually the number used on the non E-start KLR 600, that big K never updated when they changed the model, and you weights seem to bear that out.