In the US, you can get about 1kw/hr on a standard plug w/o burning the breaker too hard.
First a nit about units: You mean "you get about 1 kW".
"kW/hr" doesn't make sense as a unit because watts are an instantaneous measure; time is already divided out. "1 kWh/hour" technically makes sense but is kind of pointless because it's just "1kW * 1 hour / 1 hour". Also, a standard US outlet is 15A @ 120V = 1.8 kW, not 1 kW. There's a little loss so you get more like 1.7 kW into the battery.
I've had EVs since 2011 and they've all been about 3-4miles/kw. My overnight (10 hour) charge was closer to 30-40miles rather than your 50ish.
I've also been driving EVs since 2011 (two Nissan Leafs, three Teslas), and I get more like 5-6 miles per hour, which is consistent with the math: 3 miles/kWh = 333 Wh/mile. 1.7 kW / 333 Wh/mile = 5.1 mi / hr. 4 miles/kWh = 250 Wh/mile. 1.7 kW / 250 Wh/mile = 6.8 mi/hr.
Maybe your mileage is worse than you think? Were you not getting 15A from your outlet? Your numbers fit if for some reason you were only getting about 8A out of your wall outlet, when you should have gotten nearly twice that much.
For folks that need more than that, a 240v/50A is about $1k to install, provided the panel is somewhat nearby. Those can do about 9kw/hr, so about 27-36mi/hr of charge.
More like 50A @ 240V = 12 kW. My car will only take 48A, but my voltage is usually closer about 245 which the math says is 11.76 kW, and I normally get about 11.2 kW into the car.
Note that at 9 kW, 27 mi/hr = 333 Wh/mi, and 36 mi/hr = 250 Wh/mi, so your numbers line up there.