Video: 'Miles per gallon' can misrepresent a car's fuel efficiency. Researchers Rick Larrick and Jack Soll from Duke University tell us why a car's miles per gallon (MPG) rating can be deceiving. What's better, to replace a car that gets 10 miles per gallon with a car that gets 20 MPG or is it better to replace a car that gets 25 MPG with a car that gets 50 MPG?
"People pretty much rank order things in terms of linear improvement in miles per gallon. So, the bigger improvement in miles per gallon, that's what they think is better. That turns out not to be the case. mathematically."
"If we stick with the idea that they drive both vehicles a hundred miles per week, we can just simply ask, 'How much gas is being used?', based on each of the current vehicles.
