## 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.