Tires that our partner companies are now working on can improve gas mileage by up to 10 percent, just by changing the tires, because this rubber rolls with less resistance. (discovermagazine.com)
For instance, simply changing the action of intake and exhaust valves in a car while it is running could significantly improve gas mileage. (scientificamerican.com)
For 2009, a four - cylinder engine was added, with benefits like a lower entry - level price and improved gas mileage over the V - 6 engine. (cars.com)