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There's a blue arrow on the electric charge-o-meter, that shows the point where it'll stop switching to electric in "hybrid"mode. That's no zero but it's often close. So you won't be able to coast for miles on electric.
However it is maintaining some charge. In my experience, if you make demands on the car (put your foot down) and there's still some juice left it'll use it for boost. If it's fully depleted then, yes you'll rely on the engine only.
However, in reality it's not an issue. Either you're driving along relatively sedately and it stops at the arrow. In which case you'll have some boost left if you need it. Or you'll be gunning around, in which case you should be in Sport. On normal roads that'll charge the battery about as quick as you can use it (it really doesn't take long), as there are always points when you need to slow down. If you're on a track then yeah you'll run out eventually.
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