I always wondered what stop-start cars did when stuck on the M1 for an hour.. do they really restart the engine every 2 car lengths and are they clever enough to know when stopping it means it might not have the juice to restart it?
Now I don't know how tight a seal the piston rings make but I'd have thought stopping the engine with a cylinder fully injected at top-dead-centre would perhaps allow you to restart the engine by kicking a spark into that cylinder if the engine was warm, rather than cranking the starter motor, allowing for many more restarts. Maybe the fuel vapour condenses too fast in the cylinder when left unignited.
Perhaps that's how they work. Dunno.. Ramble ramble