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Ambivalence abounds in the nation’s major urban centers between June and mid-September, when summer-grade gas returns to filling stations. It’s more expensive per gallon and comes at a time when demand, and therefore cost, is already higher — and then adds insult to injury by reducing your car’s fuel economy. But this special grade of government-mandated gas is necessary to prevent smog from vapors and engine exhaust, in turn preventing pollution that harms plants and humans. Follow the link below to learn more, and maybe you’ll breathe a little easier next time you pay more at the pump this summer.
Former Assistant Managing Editor-News Matt Schmitz is a veteran Chicago journalist indulging his curiosity for all things auto while helping to inform car shoppers.