15: Percentage of gasoline saved by driving 65 mph instead of 75 mph

5: Maximum percentage of gasoline saved by keeping tires properly inflated

$260: Amount saved annually by each person by carpooling to work (based on five days a week, 10 miles each way, with one other person, in a 25-mpg vehicle, at $2.50 a gallon)

$1,000: Amount of the federal tax deduction available for purchasing a gas-electric hybrid vehicle this year

Source: Natural Resources Council of Maine, www.maineenvironment.org/earth_day_2005.htm.