Fuel Economy
Oil was deposited in the earth due to decaying of plants ... It took 200million years for it to form and in 200 years we have consumed half of it. If this continues it could not last more then 40-50 years. Half of fuel consumed goes to passenger cars and trucks. If we would be able to check this then this would be greatest gift from us to our comming generation. If you drive a fuel efficient car you are not only saving money but protecting environment, reducing oil imports, conserving resources for future generations.