This can be done by making vehicles out of a mix of aluminum, steel, plastic, magnesium and composites. Using aluminum and other aluminum metal composites in the body and chassis saves weight. Minimum amounts of foam padding and trim materials also help to reduce weight of the vehicle. Much of the existing housing in the U.S. is not insulated adequately or to the highest level. Older homes are likely to use much more energy than newly built homes because they have air leakage, which is the leading cause of energy waste in most homes.
Insulation is beneficial in that it helps maintain a uniform temperature throughout the home.
Steel cars face a weighty decision . Internet Source 3. Internet Source 4.