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Kia Rio
Price: $10,890 - $13,615
Mileage: 32 mpg Hwy, 27 mpg City
Sales increase: 37.2%

Like the Yaris, the Rio provides cheap, basic transportation. But with gas prices rising fast, its big fuel economy numbers have also driven sales.

Sales of the Rio's near-twin, the Hyundai Accent, have jumped about 28% compared with last year.

NEXT: Ford Focus

Last updated May 27 2008: 5:58 PM ET