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My VW PHEV does this. It doesn't use the HV battery below 20% and the range calculator knows this.

So I can die on the road with enough energy to drive another 50 km?

No. The computer in the car will say you can drive 0km but you can actually drive another 50km. How well you can drive that remaining 50km will be a separate question: the battery most likely cannot discharge fast enough for highway driving.

Thanks, that makes sense.

> So I can die on the road with enough energy to drive another 50 km?

My gas car has a 42 litre tank, if i wait until the light has come on and the gauge is on (and then drive another 20km past that), I can only get 38.5 litres in.

I'll do you one better: mine has a 45 litre tank, light goes on at 5 litres left, gauge stops indicating at half of that, but there's an unmentioned anywhere buffer of 5 litres, which is there so that the fuel pump doesn't overheat or pick up any contaminants at the very bottom the tank.

I only know this because a motoring journalist filmed himself riding the same model dry.

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