The Misleading, Wasteful Way We Measure Gas Mileage, Explained

Time for a pop quiz. Which of these trades saves more gas: A) Swapping a car that gets 25 miles per gallon (MPG) for one that gets 50 MPG, or B) Replacing a car that gets 10 MPG with one that gets 15 MPG. If you said that A conserves more gas, you're mistaken. And it's not even close. Here's why: In ...

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