SAN FRANCISCO (MarketWatch) — Tesla Motors Inc. luxury sedan, the Model S, was the best-selling electric car in the U.S. in January, according to two estimates.

A third U.S. estimate put the Model S just a tad behind the far cheaper Leaf from Nissan Motor Co. 7201, +1.31% NSANY, +0.27%

Unlike other car makers, Tesla TSLA, +4.42% does not report monthly sales data. It discloses its quarterly deliveries when it reports quarterly results.