Beware Gimmicks Promising Better Mileage

Ever-increasing gas prices are sending motorists in search of sometimes unconventional ways to improve their cars' gas mileage. Some products are geared heavily toward consumers and promise to make nearly any vehicle more fuel efficient. But "Good Morning America" technology contributor Becky Worley discovered some items may not live up to their fuel-efficient claims, which use additives, reformulators and special magnets as gimmicks. Check which items Worley found useful and which didn't...Full Story
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