CRC's new Phaseguard4 ethanol fuel treatment prevents phase separation, which is caused when ethanol separates from gasoline and blends with any water present in the fuel system. Phase separation can lead to severe corrosion, decreased fuel economy and engine performance, rough starts and hesitation. CRC says Phaseguard4 protects against corrosion, cleans the fuel system, stabilizes fuel for daily use and long-term storage, and restores engine performance. One ounce treats 10 gallons of fuel in season and five gallons for storage, and one ounce stabilizes fuel for 12 months or longer. Use with any two- or four-stroke, gas-powered engine. Phaseguard4 comes in three sizes - 8, 16 or 32 fluid ounces - that cost $12.99, $18.99 and $28.99. Call 800-556-5074, or visit www.crcindustries.com/marine.