There is no real time barrier to brimming an ICE tank (another 30 secs holding the pump), but ICE motorists should normally fill up before finding a forecourt becomes critical.
Probably somewhere below a quarter full, not 20 miles after the warning light has made its presence known if they have any sense.
An EV with (say) 250 miles range from full prudently needs a recharge every 150-200 miles (a) to avoid risk of a flat battery, and (b) whether recharge is full to 100% or fast to 80%.
Whether this is a real barrier to ownership is questionable. I am fortunate to be able to recharge at home, but once or twice a month a 200 mile effective range would be a real constraint. So no EV for me until a fast charging network is both widely available and reasonably priced.
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