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Open Windows = Better Gas Mileage?
by Meg Duley,posted May 27 2014 6:04AM
A new study conducted by the website Vox found that contrary to popular beliefs, an open window is always more fuel efficient than using the AC.
Depending on speed, having air conditioning on at a medium level can reduce the fuel efficiency of a car by nearly 10 percent. The new research disproves previous theories that the drag caused by having an open window makes use of an air conditioner a more practical option at speeds above 70mph.