Interesting quote from the link:
"The Department of Transportation also reported that the average
fuel efficiency of trade-ins was 15.8 mpg (miles per gallon), compared to 24.9 mpg for the new cars purchased to replace them, translating to a 58% fuel efficiency improvement.
[1]
A study published after the program by researchers at the
University of Delaware concluded that for each vehicle trade, the program had a net cost of approximately $2,000, with total costs outweighing all benefits by $1.4 billion.
[15][16] Another study by researchers at the
University of Michigan found that the program improved the average fuel economy of all vehicles purchased by 0.6 mpg in July 2009 and by 0.7 mpg in August 2009.
[17]"
2000 dollar per vehicle for a net gain of 0.6 to 0.7 miles per gallon... Seems kind of paultry. I'm sure we're back down on MPG again.
Suspect after Model 3, if this is re-instituted it would be much higher.