I usually get in the mid 40's running my caribou cases at about 85mph
If I slow down, I can get it over 50
Going through Yellowstone last fall, From Cooke City to Jackson Hole, I got about 64MPG!!! Wife got in the low 70s with her 658. Thats what 45mph all day will do... I kept wanting to stop for gas, but gauge wasnt going down, I thought it was broken. Then when I filled up, wasn't even near empty!!
2010 F800gs (Mine) 2011 F650gs (Wifes)