Question: Assume that the typical car lasts 15
years. The car is driven 14000 miles per year with 9000
miles in a city and 5000 miles per year on a highway. The fuel
efficiency in miles per gallon for the Toyota Prius and the Toyota Corolla are
presented below.
Fuel Efficiency in Miles
Per Gallon


Toyota Prius

Toyota Corolla


City

51

30

HWAY

48

42

Each gallon of gas consumed results in the
generation of 19.6 pounds of carbon dioxide.
What is the difference between the CO2 generated
over the lifetime of the Prius compared to the lifetime of a Corolla?
Answer: Get annual gallons consumed by dividing
miles/(miles/gallon). Multiply by 15
years. Multiply by 19.6 pounds of C02 per gallon of gas.
Calculation of CO2 Reduction obtained by
Replacing a Corolla with a Prius


Prius

Corolla

Difference


City MPG

51

30

21

Hway MPG

48

42

6

City Miles

9000

9000

0

Hway Miles

5000

5000

0

City Gallons Annual

176

300

124

Hway Gallons Annual

104

119

15

Total Gallons Annual

281

419

138

Total Gallons Lifetime

4210

6286

2076

Pounds of CO2

82507

123200

40693

Concluding thoughts: Environmental benefits of Prius are considerable 
20 tons of CO2 over 15 years in this example.
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