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All but one Orange County-based automaker beat the relatively flat national sales pace for new vehicles in March, according to New Jersey-based market researcher Autodata Corp.

U.S. auto sales grew 0.6% last month, adding up to 1.54 million cars and light trucks, and are on pace to reach 17.15 million for the year.

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Hyundai Motor America in Fountain Valley sold 75,019 vehicles nationwide—its best month ever—a 12% increase over the same period last year. The automaker’s sales so far this year are up 7.5%, for a total of 172,029 cars and light trucks.

Kia Motors America Inc. in Irvine reported selling 58,771 cars and SUVs, a 7.3% uptick from a year earlier. Its year-to-date sales totaled 141,100, up 6.1%.

Mazda North American Operations’ sales were down 8% with 32,123 new cars and light trucks sold in March. The Irvine-based automaker remained flat for the year, with 78,044 vehicles sold during the first three months of the year.

Cypress-based Mitsubishi Motors North America Inc. sold 9,764 vehicles, an 8.5% increase. Its year-to-date sales totaled 19,840, a 19.9% uptick over the same period last year.

U.S. auto dealers have sold 3.95 million vehicles so far this year, a 5.6% increase compared with the same 3-month period last year.