The MPG Illusion

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The MPG Illusion
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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?

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The MPG Illusion

• What would Buddys 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?

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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.

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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?

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