If I'm passing one of them pot hole dodgers I might take up as much room as a car, maybe over to where the car would have his off-side mirror, but not too close to the oncoming stuff, depending on the full road width.
Or alternately, if the pedal pusher has just pissed me off further back down the road, he might just get an Alpinestar up his ring piece to assist him on his way,.. so that would make the passing distance somewhere about a couple of foot!