As he did last year, Mr. Pelmear left his home in Napoleon, Ohio, last week to drive his Mustang out to the annual Specialty Equipment Market Association show, which starts today and runs through Friday in the Las Vegas Hilton.
His automobile is one of about 100 displays in the show's second annual "Making Green Cool" zone, said John Waraniak, the trade group's vice president for vehicle technology.
Mr. Pelmear has not publicly disclosed the technology behind his design, saying that he was awaiting submission of his patent applications before he would show or explain how his engine works. His mileage claim has not been verified by independent third-party testing, although his vehicle and engine have undergone emissions testing.