1. The conventional gasoline powered Honda Civic is one of the best gas powered cars in its class for mileage.  The conventional Honda Civic gets 35 MPG during city driving and 40 MPG freeway.  When the exact same car is given a hybrid-electric engine, mileage is 47 MPG city and 48 MPG freeway.

The hybrid costs $20, 650   and the conventional model costs $16,000

You plan to drive mostly in the city, to and from work and for weekend errands.  You expect to drive 8,000 miles a year in city driving, plus another 4,000 miles in longer trips that would count as highway.

A. How much would you spend on gas for the hybrid Civic in one year, assuming gas costs $1.89 per gallon?
B. How much would you spend on gas for the conventional Civic in one year, assuming gas costs $1.89 per gallon?
C. How long would it take for the savings in gas costs to offset the increase in the price of the hybrid?

2. The Toyota Prius get 60 MPG city and 51 MPG freeway.  The "best selling car in America" is the Ford F-150 truck.  The 4WD, V6 version ot the F-150 gets 15 MPG city and 19 MPG highway.

A. The average American drives 12,000 miles per year.  Assume that most people do 3/4 of their driving in stop and go city traffic, and 1/4 in freeway traffic. How many gallons of gas would be saved per person by driving a Prius over the F-150 in one year?
B. Assume every gallon of gas burned contributes approximately 20 kg of carbon dioxide to the atmosphere.  How many extra kg of carbon dioxide are put into the atmosphere by the F-150 in a year , when compared to the  Prius?