Back in the dumb phone days, driving through New Jersey, of all places, used to kill my battery. If you're not familiar, NJ is the most densely populated state in the US, but the northwest part of the state is mostly wooded, fairly mountainous, and sparsely populated.

I'd be driving from Pennsylvania the NYC suburbs, but northwest Jersey at the time had spotty service and a lot of analog networks. It was a real battery killer.