Please provide a sun zone map of the U.S. (where the majority of the cars will be sold in the near future) with the state lines on it. That would provide a much easier to interpret what the energy availability would be in the areas where we live. The world map is interesting but does not easily clarify the energy potential in the areas where we live.
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Pinpoint accuracy doesn't really matter much. It's an estimate based on past weather patterns, which are subject to change. You don't suddenly get 4 extra miles/day by parking in zone 4, across the street from where you live in zone 2.
If this is useful too?