New York Times: The “cash for clunkers” program seems to be doing its job: people flocked to dealerships to use the rebates and trade in their old vehicles for new, more efficient ones. Dealers estimate they sold nearly a quarter million cars under the plan, almost exhausting the program’s $1 billion budget in about 10 days. The new cars achieved 10 miles per gallon more, on average, than the trade-ins. This was an encouraging sign that incentives can persuade drivers to ditch gas hogs for smaller …