`French Fries With That Quart Of Oil?'

After 26 years as a McDonald's franchise owner-operator, Thomas R. Weber can put together a milk-shake machine blindfolded. He has bagged fries by the million and trained platoons of store managers in grilling burgers. Now, he's learning how to change the filter on a gasoline pump. "I was reluctant at first, but it's not that big a deal," he says.

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