Friday, May 31, 2019

Carbon emissions Prius vs Corolla


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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