I'm meticulous about checking mileage when I check. Everything is corrected, mileage, speed, etc.
Mostly I get around 50 mpg around town/highway mix. How you drive is the key. If you accelerate hard you use more fuel. I you use your brakes hard you use more fuel. If you travel at high speeds on the highway you use more fuel. If you have side bags you use more fuel. I don't have side bags on the Versys, just a top box.
On the highway I sometimes do 600 - 700 mile days. First tank usually doesn't have as high fuel mileage. On long trips I figure mileage on several tanks to eliminate some of the inconsistency in fill levels.
So traveling at 68 mph (indicated with 16T) 70 mph (true) about 5,200 rpm I consistently get in the 55 mpg range. Correction factor for the odo is 1.07 (reads low because of 16T). Mileage is usually figured off GPS as well. I often run out a tank at on sitting, around 200 miles.
Crusing at 100 mph I can averate in the 40 mpg range.