DETROIT: US car dealers say Chrysler Group's Let's Refuel America incentive program offering gasoline at $2.99 per gallon is boosting sales, prompting the auto giant to extend the promotion through July.

The campaign gives buyers of new vehicles the option to cap the price of their fuel for three years, a sweetener that has so far pushed Chrysler's May retail sales up by 15% compared with April.

Says head of North American sales Steve Landry: "The dealers are, first of all, very happy that we have taken a step out of the normal for incentives and have tried something different while we're in a market that is completely out of the normal."

US auto sales dropped 8% overall in April, and analysts now project sales for the year ahead at around 15 million vehicles, down around one million on 2007.

Data sourced from USA Today / Reuters; additional content by WARC staff