'Range anxiety' is the worst here

All eyes in the automotive world will be on Elon Musk Thursday, when the Tesla CEO has promised to reveal a software update to its Model S vehicle that will "end range anxiety."

The news is a push toward curbing two of the biggest concerns of potential electric car buyers, who can be deterred by worries about how far the vehicle can go, and the time it takes to recharge its batteries.

Although there are more than 9,000 charging stations across the country—the majority of which are operated not by Tesla, but by ChargePoint or Blink—these concerns are particularly troublesome for drivers in certain areas of the Midwest and Mountain West regions, where charging stations are few and far between.

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Tesla doesn't break down its sales by state, but industry experts estimate the majority come from California, which is highly penetrated with stations.

Given that the Model S already has greater range than any other pure electric vehicle sold in the U.S.—something few expect to change anytime soon—what does Tesla have in mind with its software update?

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Many believe the company will push an update over the air to all Model S cars, so the vehicles can better manage energy distribution from the battery pack. Because the battery would be used more efficiently, that change could allow the car to have greater range.

Last year, Tesla sold approximately 17,500 Model S cars in the U.S.

Questions? Comments? BehindTheWheel@cnbc.com.