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The EPA says 78 vehicles that used to qualify as trade-in vehicles under the program no longer do. The agency also added 86 vehicles that didn't previously qualify to the list.
The change came after the EPA reviewed the fuel economy of 30,000 vehicles from 1984 and newer, as required by the program's legislation.
The review caused mileage data to change upward or downward due to rounding.
The program took effect over the weekend, and allows consumers to receive a federal rebate between $3,500 and $4,500 to trade in a vehicle that gets 18 miles per gallon or less and purchase a more fuel efficient one.
Nearly 20,000 car dealerships have signed up for the program with the Department of Transportation.
The Associated Press contributed to this story.