Urine
The single biggest impact you can have on your MPG is buying tires with lower rolling resistance. That's code for less grippy, less performance tires. Since switching to RE-11s (high rolling resistance), my fuel economy blows even with pretty modest driving style (~17 city/21 highway). But that's the name of the game with a performance car.
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2013 Cadillac V-Wagon, RIP Z
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