The MPG Illusion

# The MPG Illusion

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## The MPG Illusion

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##### Presentation Transcript

1. The MPG Illusion

2. Fuel Efficiency • Ace drives a car that averages 10 mpg and is considering trading it in on a new car that averages 12 mpg. • Buddy drives a car that averages 30 mpg and is considering trading it in on a new car that averages 40 mpg. If they both drive about the same number of miles in a year, who would save more gas by making the change?

3. The MPG Illusion What would Buddy’s new gas mileage (in mpg) need to be in order to achieve the same savings in number of gallons of gas used in a year as Ace would achieve in increasing his mileage from 10mpg to 12 mpg?

4. The Illusion of MPG • Write a formula for fuel usage in gallons per 10,000 miles as a function of mileage in mpg. • Construct a graph based on your formula. • Use the graph to explain the illusion of mpg.

5. Going Green Write a formula for computing expected annual fuel cost for a driver averaging 14,000 miles per year assuming gas costs \$4/gallon based on… • A. x = fuel efficiency in mpg • B. x = fuel efficiency measured in gallons per 10,000 miles Which formulation of fuel efficiency ratings would help people make better decisions?