In a review of a Roadster prototype in March 2008, before the cars were in serial production, Motor Trend gave a generally favorable review, stating that it was "undeniably, unbelievably efficient" and would be "profoundly humbling to just about any rumbling Ferrari or Porsche that makes the mistake of pulling up next to a silent, 105 mpg ‑US (2.2 L/100 km; 126 mpg ‑imp ) Tesla Roadster at a stoplight"; they nonetheless detected a "nasty drive-train buck" during the test drive of an early Roadster with the older, two-speed transmission.