an average vehicle puts out nearly 20 lbm of carbon dioxide into the atmosphere for every gallon of gasoline it burns, thus one thing we can do to reduce global warming is to buy a vehicle with higher fuel economy. a U.S. government publication states that a vehicle that gets 25 rather than 20 miles per gallon will prevent 10 tonsof carbon dioxide from being released over the lifetime of the vehicle. makeing reasonable assumptions, evaluate if this is a reasonable claim or a gross exxageration.