Geo

A subcompact car sharing mechanicals with the Suzuki Swift, offering a combined 34 mpg with a 1.3-liter engine or 36 mpg with a 1.0-liter engine.

The gasoline-electric system used in the Toyota Prius, contributing to its fuel efficiency.

Engines that use diesel fuel, promoted by Chrysler as providing comparable fuel economy to hybrids without sacrificing performance.

Honda's second-generation system used in the Civic Hybrid to improve fuel economy.

United States

A subcompact car sharing mechanicals with the Suzuki Swift, offering a combined 34 mpg with a 1.3-liter engine or 36 mpg with a 1.0-liter engine.

A hybridized edition of the Civic using Honda’s second-generation Integrated Motor Assist system, delivering a combined 41 mpg and offering the option of a manual transmission.

Models featuring a 1.9-liter diesel engine that achieves up to 36 mpg combined, with upgrades for improved fuel economy, emissions, and performance in the 2004 model.