Why is premium gas so expensive? More Americans are filling their cars with it

Why is premium gas so expensive? More Americans are filling their cars with it
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By David Goldman, CNN (CNN) — The price displayed above that third button on the gas pump averaged more than $5.40 for several days this spring. American drivers still couldn’t get enough. Premium gas now costs around a buck a gallon more than regular – way more than the price “premium” that ...