How 'bout doin' 65mph in the "slow lane", (trying to keep out of the way of traffic, even though the posted limit is 55 mph), on a cold snowy morning w/ a dusting of snow on the highway (just enough to make it slick), and you still have people blasting by you doing 75, 80, plus...in their rice-rockets or uber-SUVs, yappin' on the cel phone, puttin on the make-up, etc, while you're there in the "slow" lane listening to that long-stroke bolt scream, wondering how much more it'll put up with....
And that's in a '72 C-10 !!!
Better-off taking "the milk route" (& stopping for ice cream along the way!)
(sigh)
Gotta keep those revs down to get any kind of respectible fuel "economy"...