By Mike Timmermann, clarkhoward.com
Engine-cleaning additives in gasoline are worth the extra price to keep your car healthy, according to independent laboratory testing from AAA. The group found significant differences in the quality of gasoline sold nationwide.
AAA: Pay more for high quality gas
Since 1996, the Environmental Protection Agency has required a minimum level of detergent for all gas sold, but Top Tier gasoline brands have an enhanced level of engine-cleaning additives.