MCN (USA) test weigh bikes Wet. They claim tanks are full.
Here are a couple weights from recent issues that you can squeeze into your list. (nice job by the way!
BMW R1200GS MCN sept. '08 536 lbs.
BMW F800GS MCN Jan. '09 490.5 lbs. (ABS)
BMW F650GS MCN April '09 473.5 lbs. (note: there is a mistake on spec sheet, this is the true wet weight as shown in the text of the article)
Neither bathroom scales nor giant truck scales are not all that accurate for weighing motorcycles. Truck scales are optimized for accuracy around 10,000 to 15,000 lbs. more or less. Weighing front then rear wheel on a common bathroom scale is just not accurate.
Been there, tried it.
It under weighs.
The best we've found for weighing bikes is at a near by hospital, back at the laundry loading dock. There is a nice ramp up to the scale, and the scale is drive on. It's used to weigh bins of laundry before they go out on a truck.
This scale is certified and checked annually. It's range is from Zero to 1000 lbs. which is about perfect for accurate measurements on MC's. Very fancy piece. The whole bike fits on it and is perfectly level. It's very accurate in our experience. Many hospitals have these types of scales. We know the chief maintenance guy for the whole hospital .... so have an in