The changes will add $1300 to the cost of each new vehicle.
The new vehicles would be put into service in early 2006.
By 2020, these Americans are expected to buy more than six million new vehicles a year.
The cost of the new vehicles was given as £11m.
These new vehicles will come on the market over a long period of time.
The new vehicle came into view when the old pulled away.
The treatment costs can then be passed on in the price of new vehicles.
More than 16.1 million new vehicles were sold in 2007.
In 2007, the average new vehicle sold for about $28,000.
However, a small group started the design and the construction of the new vehicle.