Define 'fully warmed up'.
I'll first engine off once the coolant hits it's normal spot, plus a few km. I don't want more cold starts than necessary.
My Fiat has auto stop start and will switch of once the coolant reaches about 60*C, which is a bit low for my liking so I leave stop start off until 88*C (normal coolant temp).
In either case the engine won't be fully up to temp for many more miles.
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