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Understanding the MPG Illusion: Evaluating Fuel Efficiency Gains

This discussion explores the MPG illusion in fuel efficiency by comparing two drivers: Ace, who drives a car averaging 10 MPG and is considering upgrading to one averaging 12 MPG, and Buddy, who drives a car that averages 30 MPG and is contemplating switching to one averaging 40 MPG. The analysis aims to determine who would save more gas with the respective upgrades, what Buddy's new MPG would need to be to equal Ace's savings, and introduces a formula for calculating fuel usage in gallons per 10,000 miles. The goal is to better understand fuel efficiency ratings and their impact on consumer decisions.

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Understanding the MPG Illusion: Evaluating Fuel Efficiency Gains

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  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?

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