I commute four times a week over some country roads - I've been doing it for about 2 years now.
On this route there are some very - think 12 - 14% gradient - steep hills. Today on my way home, a Mini driver was behind me for a good 20 miles.
On flat/straight bits of road I'm fine at 60-65mph (and so is my little car), but on the hills my car really struggles - even if I drop to a low gear and properly rev it, which can't be good for my engine to do all the time, I struggle to get above 35-40mph.
Obviously this isn't ideal on a national speed limit road, but I'm literally unable to go any faster, and on some bits of the route I will pull in if there's a few cars behind me and I know I'll hold them up, but some places there isn't the opportunity - it's very rural and there aren't many places to pull up.
The Mini driver behind me dropped really far back on flat or straight bits, suggesting he didn't really have an issue with my speed (which was at the speed limit, so tough shit if he did), but every time we got to a hill he'd be aggressively up my arse, and at one point he flashed his full beams at me - only to drop all the way back when we got to the top!
My car isn't best suited for my commute, but it's all I can afford at the moment - knowing I'd have a lot of commuting, I opted to hire purchase something that was almost-new so I'd feel safe with all the driving, and a bigger engine was out of my price range. It's fine on the motorway and goes comfortably at 75, but the motorway version of my commute is 30 miles longer which, over a week, adds up a lot on my mileage, so I prefer the other way.
AIBU not to have a car that can handle the steep hills, or was the other driver just being a dick? I'm still a relatively new driver and sometimes worry if there's bits of driving etiquette I don't know yet (hence pulling over before big hills if I can - I don't want to hold anyone up!).