As the owner of a hybrid, yes they will run on fuel only. You might think the spark plugs won’t fire, but the engine still has a standard car battery. The drive battery is entirely separate. Either way there is almost always some amount of energy running into the drive battery. Braking, going downhill, coasting to a stop, and anything that reduces the load on the engine uses a system to regenerate power back into the batteries. Even when it’s low, the engine will engage the generation system and charge the battery to 30% consuming a little bit more fuel in the process, but in theory using less in the long run.
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