NEW YORK - Chrysler LLC has been demonstrating plug-in hybrid prototypes to some dealers that are further developed than those previously shown by the automaker, the company's president said.

In comments Tuesday at the Motor Press Guild in Los Angeles, Chrysler Vice Chairman and President Jim Press said the vehicles are being developed by Chrysler's Envi unit, which the automaker created last year to create electric vehicles and other advanced propulsion technologies.

Chrysler spokesman Rick Deneau confirmed the comments and said the prototypes are further along than the concepts the company unveiled in January.