I try to stick in the left 1/3 of the lane whether back road or highway ( usually about where the cager's left tires run- let them pick up the nails before I get there! ). As far as which lane when there is a choice, I start off in the right lane and migrate to the left when I encounter slower traffic, then return to the right when lanes are open. In high traffic highway situations I try to stay out of the right-most lane.