Stan Moneymaker needs 13 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 ?$0.06 per gallon on the price of gasoline. Suppose gasoline costs ?$3.30 per gallon and? Stan's car gets 25 mpg for? in-town driving. Each mile that Stan drives creates one pound of carbon dioxide. Each pound of CO2 has a cost impact of ?$0.03 on the environment. What are? Stan's savings per mile for the eight mile extra? trip, including the effect of environmental? costs?