Phony Gas-Saving Devices Under Scrutiny

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Prod­ucts that false­ly claim sig­nif­i­cant fuel-mileage increas­es are again emerg­ing due to high gas prices and the arrival of the sum­mer dri­ving sea­son. The EPA has test­ed more than 100 such prod­ucts, and all failed to show sig­nif­i­cant gains in miles per gal­lon of gaso­line.