Gen 2.
Hard to say miles as I'm not going near zero, I'll check later for more detailed info, but on a road trip yesterday covering 150 or so miles total we left at 100% and had a low battery warning three times and three on-route rapid top-ups (two about 10 minutes and one (near destination) of over 30 minutes). Almost all motorway, fastest I went was an indicated 64moh to overtake a car wandering lane to lane slowly.
I wouldn't want to go slower than I was on a motorway, I know people do, but I'm not particularly at those speeds, let alone 50 or less, feels unrealistic for most drivers
The last ten miles I went quick with low battery as frankly I was bored, getting tired and bed was calling and within range at any reasonable speed!
Two up for a change too.
Could I get 100? Maybe if I went out of my way to do so, but I never have. Closest was 94 or 96 when he car was quite new and we were a bit reckless.