With the summer driving season approaching and the price of gas continuing to rise, AMSOIL is extending the P.i. Money-Back Guarantee through August 31, 2011. P.i. Performance Improver is so effective, AMSOIL offers a money-back guarantee on the product’s fuel economy benefits. First-time users who fail to see improvement in their vehicle’s fuel economy receive a full refund of the purchase price. For complete qualifications or to order, visit the P.i. page at www.amsoil.com/storefront/api.aspx