I think there might be a couple of problems with the underlying logic of those maps. I don't see how they could be getting true usage data, only sales. I would bet that a lot of rural counties have their sales bumped up by urban people stopping for gas when travelling between cities. Take for instance the drive along I-80 between Reno and Salt Lake city. Almost anyone making that 500+ mile trip is going to stop for gas enroute, in a county where the population is only a few thousand.
Then there's the question of how much rural gas is actually used by farmers who are producing food for the urban areas...
|