WOOSTER, Ohio — Buehler Food Markets here recently converted one of four tractor trailers — which are used to pick up and deliver local produce — from diesel to waste vegetable oil (WVO), which generates less greenhouse gas emissions than diesel oil. "We expect the truck to use 250 gallons of WVO per week," said Scott Buehler, vice president of real estate and new store development. More semi trucks may be converted, depending on the amount of waste oil produced. Over the past six months, ...

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