Stan moneymaker needs 15 gallons of gasoline to top off his automobile's gas tank. if he drives an extra eight miles (round trip) to a gas station on the outskirts of town, stan can save $0.10 per gallon on the price of gasoline. suppose gasoline costs $3.90 per gallon and stan's car gets 25 mpg for in-town driving. should stan make the trip to get less expensive gasoline? each mile that stan drives creates one pound of carbon dioxide. each pound of co2 has a cost impact of $0.02 on the environment.