Car manufacturers in the United States reported their best results so far this year in August, in large part due to a government scheme aimed at encouraging people to trade in their old cars for more fuel-efficient new ones. The top results among American carmakers were posted by Ford which saw its sales rise by 17% from August of last year. The results held increase US manufacturing output as a whole for the first time since January of last year. President Obama said the latest figures indicate that the American economy is on the path to recovery.