Duty driven: SUVs: small, efficient ones handle everyday jobs, but traditional SUVs can carry the big load.(sport utility vehicles)(Buyers guide)

Rising fuel prices are a big factor in stalling sales of large SUVs. Meanwhile, consumers are buying smaller, fuel-efficient car-based SUVs at a brisk pace. They may not match the big trucks in terms of cargo space and towing capacity, but their blend of economy, roominess, and ride comfort explains the growing number of buyers each year.

The car-based SUV category has quickly grown since Toyota pioneered it with the RAV4 in 1996. The redesigned RAV4, tested here, once again leads this growing segment.

Most car-based SUVs can handle some light off-road duties and light towing. And fuel economy is much better than in larger SUVs. But the larger trucks can tow loads of 5,000 pounds or more if properly equipped.

We tested a group of three small SUVs and a group of three large three-row SUVs. All were equipped with all- or full-time four-wheel-drive.

For the small SUVs, we compared the redesigned Suzuki Grand Vitara, the four- and six-cylinder versions of the Toyota RAV4, and the freshened Subaru Forester. For our larger SUVs, we purchased the redesigned 2007 Chevrolet Tahoe, a V6 and V8 version of the freshened Ford Explorer, and the new Jeep Commander. Prices for the small SUVs ranged from $22,894 for the Grand Vitara to $30,328 for the V6 RAV4. The larger trucks ranged from the $35,520 for the V6 Explorer to $42,849 for the Tahoe.

The RAV4, our new top-rated small SUV, is wider and longer than the previous one, resulting in a roomier rear seat. And it now offers an optional V6, which is quick and refined, and a third-row seat.

The Forester was formerly our highest rated small SUV, and it remains a sound design. It has standard all-wheel drive, a comfortable ride, and responsive handling. But electronic stability control is not available.