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GM debuted its eAssist technology, which is actually a mild hybrid, on the 2012 Buick LaCrosse at the 2010 LA Auto Show. With plans to offer the technology on many its other models, the automaker recently introduced the technology on the new Buick Regal at this year’s Chicago Auto Show. Like its LaCrosse counterpart, the eAssist Regal gets significantly improved fuel-economy, achieving 26mpg city and 37mpg highway.

In the Regal, the eAssist system is mated to the model’s 2.4L four-cylinder and uses a 115V lithium-ion battery tied to a small 15 horsepower electric motor. Regenerative braking, automatic start/stop, lower rolling resistance tires on 17-inch alloys, a powerflow readout in the infotainment screen, and an eco guage on the instrument panel all help the Regal get its 26/37 mpg.

The eAssist 2012 Buick Regal will go on sale in the fall of this year. More details can be found in GM’s press release.