• The noise made by a car engine that goes with 4000 rpm is equivalent to 32 cars running at the same speed, but with 2000 rpm.
• If the tire pressure is 25% lower than the optimum, asphalt friction increases by 10% and hence fuel consumption increases by 2%.
• A car pollutes: when raw materials are produced, during the manufacturing process, at car servicing and repairs, while using and disposing it and at the end of its life cycle. Of all these stages of life the most polluting is while driving it. During its average working time, a car pollutes eight times more than during the manufacturing process.
