Chrysler LLC may eliminate the highest trim levels of its Dodge Avenger and Chrysler Sebring sedans while adding more luxury amenities to the mid-level models of those vehicles, Bloomberg News reports. The revisions, part of a strategy called "Fight Back," mean less-expensive models would have standard features such as heated seats that are now offered only in costlier versions, according to a document sent to parts suppliers, Bloomberg reported on Thursday. The strategy may help sales of those sedans, two of Chrysler's more fuel-efficient cars. The Auburn Hills automaker's truck-heavy line up has caused sales to slump even worse than its rivals. Chrysler sales are down 22 percent so far this year, while the industry is off 10 percent, according to Autodata Corp.