Depends how you're driving surely? Constant 70mph then sure, but start stop or 30mph around town then it should be able to
This, the i3 Rex can sustain the battery when its traveling at about 60-65 on the motorway but if the battery is flat and you go up hill for a sustained period your speed will drop. However in stop start traffic it will be able to recharge the battery. That’s why all the yanks recoded their cars to the EU spec so they could turn the Rex on at 70% instead of when it’s nearly flat.
Just like a PHEV you need to know how to use a REX to get the most out of it. If your going past the range of the battery you need to end the journey on zero battery to get the most of out of it so ‘recharging the battery’ is utterly pointless and just costs you money.
The Rex is normally two things, a get out of jail free card for when you run out unexpectedly or something to utilise when you plan long journeys. If you know your going on a long journey you want to kick the Rex in as soon as you can and then turn it off once your within battery range of your destination. Because of the way the Rex works battery power will continue to drop at motorway speeds but it will be a slow trickle. The trick is to turn the Rex of at exactly the right time so you get back to your at the battery gets to 6% or whatever the minimum is for the Rex to kick in again.
The main reason they didn’t take off is that it’s now just cheaper to put enough battery range in the car to cover all but the longest journeys which people seldom do in generally. The batteries also recharge fast enough not to make those long trips a complete PITA. Most people would trade never having to go to a fuel pump again for having to visit a rapid charger 3-5 times a year. Most people that bought the Rex version rarely if ever used it.
The only real issue is now only the TCO doesn’t work on smaller cheaper cars, supply of vehicles and people without a suitable charging location. The tech itself is fine in the main for the vast majority of people.