like toyota_lover pointed out, it's not the speed. it's the
flow. even if i'm going 90 on the right lane, i'll still be guilty
of road hogging if
1) there's more than a couple of cars on my tail and
2) i'm not overtaking someone else on the middle lane.
taxis love to stick to the right for that little while more after
overtaking someone on the middle lane just to hold back traffic a
little and live up to their infamous reputation. something like
that. don't believe it when they claim it's in the interest of
safety, making sure there's ample space before they cut back into
the middle 
but seriously, the jokers who take the right at 90 when _both_ the
middle and left are clear and there're shitloads of people on their
tail. without name-calling, the predominately "value-for-money"
cheapest japanese compact sized cars of netural colours would
decieve themselves thinking it's a right to stick to the right
since they're doing close to the legal limit. morons.
it's people like that who speed up instead of giving way to
emergency vehicles, slam on their brakes at junctions without
regards to vehicles behind them and ignorantly assume that they
only have to give way to pedestrians at destinated crossings
only.
sticking to the letter of the law dosen't make a driver right.
ensuring a pleasant drive and no accidents for all involved, morons
included, makes a good driver.