According to the most recent government data, the 10 most fuel-efficient automobiles account for less than 2 percent of American vehicle sales.

The 10 most fuel-efficient models, they pointed out, account for less than 2 percent of sales.

Use this guide to choose the cleanest and most fuel-efficient vehicle that meets your needs.

The company builds the least polluting sports utility vehicles currently on the market, although not the most fuel-efficient.

These vehicles are some of the most fuel-efficient and affordable cars on the market.

Congress even rejected the idea of rating tires for fuel efficiency, which might have encouraged consumers to buy the most fuel-efficient treads.

Given those constraints, find the five most fuel-efficient search patterns and present them to me.

Use the Green Vehicle Guide, to find the vehicles that are most fuel-efficient and have the cleanest-running engines.

The resulting HS 250h would become the most fuel-efficient in the Lexus lineup at its debut.

Billed as one of the world's most fuel-efficient aircraft, it claims to offer better air quality and a smoother, quieter flight.