Once again, Toyota (NYSE:TM) continued to gain ground on its U.S. rivals in their home market. While the automaker still trails Ford (NYSE:F) for the No. 2 spot, a few more months like March 2007 could change that.

March was a record-setting month for Toyota. It increased U.S. sales by 11.7% on its way to selling 242,675 vehicles, surpassing its previous high set last July. With gas prices and environmental consciousness high, Toyota's hybrid Prius posted its second consecutive month of record sales, more than doubling last year's total units sold.

Overall car sales were also strong, surging 19.4%. Although truck and SUV sales were only 2.7% higher, Toyota's redesigned Tundra pickup continued to gain new buyers; its sales pulled ahead by 11.8%. While its sales aren't even one-fifth of those of Ford's leading F-series, the Tundra is becoming a player in the profitable pickup truck segment.

However, Toyota wasn't quite perfect in March. Each of its Scion models posted decreased sales results for the month. Luckily for Toyota, the Scion brand is a niche player, so its sales have little effect on overall results.

It's basically a given that Toyota will supplant Ford as the No. 2 seller of autos in the U.S. within the next several months. With a diverse lineup featuring a plethora of gas-sipping options, Toyota will continue to gain market share, particularly in the summer months, when gas prices generally climb higher.

Toyota is obviously firing on all cylinders, and its stock has gone along for the ride. Its forward P/E on fiscal 2008 estimates of 13.3 is above that of foreign competitors Nissan (NASDAQ:NSANY) and Honda (NYSE:HMC), but it's still relatively low given the company's health and strength within its industry. That means investors may still have a chance to ride with Toyota.

To learn more about Toyota's dominance in the auto world, read:

Fool contributor Mike Cianciolo welcomes feedback and doesn't own any of the companies in this article. Nissan is a Global Gains pick. The Fool has a disclosure policy.