add the entire bottle of CRC guaranteed to pass to your gas tank before filling up with fuel. This ensures the product is mixed well with the fuel. Fill your tank with gas. Drive your vehicle as usual until the tank is nearly empty. Refill with gasoline and your vehicle is ready to pass the state emissions test. CRC, guaranteed to pass, cleans the entire fuel system for easier starts, faster acceleration and noticeable improvements in power and performance. Don't risk failing your emissions test Plan ahead and avoid the hassle and added costs of a retest AB CRC guaranteed to pass to at least one tank of fuel before you test guaranteed means guaranteed. Pass your emission tests or get double your purchase price back from C. R. C.