Some used cars in New Jersey that have the mileage ratings required for use in the CARS program, commonly known as Cash for Clunkers, may not actually meet the guidelines for the program and buyers may choose to hold onto their vehicles instead.

Consumers who were considering leveraging their used cars for the discount found that the Environmental Protection Agency had “refreshed” the mileage numbers of several automobiles, making them ineligible for the program, reported Edmunds.com.

“It’s unfortunate that consumers who had been researching and planning to trade-in their vehicle with the new Cash for Clunkers program are now left in the dust,” said Karl Brauer, Edmunds.com editor-in-chief.

The site says that more than 30,000 used cars in New Jersey and other states may be affected by the changes, with examples including a 1993 Toyota Camry wagon that was sold with a combined mileage rating of 18 miles per gallon, qualifying it for the program. The EPA has now revised its rating to 19 mpg.

Other examples provided by the car website include the 1992 Saab 900s with automatic transmission and the 1988 Toyota 4Runner.