Lastly, all-terrain tires generally have a lower day-to-day cost than mud-terrain tires due to better fuel economy. Their ...

Once the tire is properly inflated, the regulator closes off the pumping tube ... at optimal levels. Under-inflation means less evenly distributed pressure on the road. It also reduces the tread ...

and Onstar can alert you when your tire pressure is low. Devices that actually do the re-inflating for you do exist but mostly in the trucking industry. The systems cost too much to install in ...