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DALLAS The National Advertising Division of the Council of Better Business Bureaus said Shell Gasoline would no longer promote a fuel economy claim it used in a $25 million ad campaign last June.
The organization investigated the truth and accuracy of certain claims that were challenged by Chevron USA. Those claims stated Shell’s gas “reduces friction between moving parts inside your engine, like pistons and rings, which slide more easily inside cylinders,” and that its fuel allows “up to five extra miles per tank” and results in “better mileage.”
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