Firefly CLEAN Fuel Bulk Lamp Oil &ndash; 5 Gallons &ndash; Smokeless/Virtually Odorless &ndash; Longer Burning ALTERNATIVE, LONGER BURNING FUEL THAN PARAFFIN LAMP OIL OR KEROSENE - Inhouse testing showed A significantly longer burn time of more than 30%. It's actually quite longer. See the Reviews. IMPORTANT: To achieve a smokeless burn, please review the User Guide PDF which is found under Technical Specifications on this page below. We will send you a TIPS email detailing Best-Use Practices. Remember, you can get any fuel to smoke if improperly used. Follow our advice and you will be very pleased. CLEAN BURNING, ODORLESS, SMOKELESS & CLEAR - Be sure to use a NEW wick and keep the height as low as possible, about 1/16 above the wick holder. Maximum flame will be achieved in about 5 minutes. Also NEVER MIX our fuel with another fuel. Be sure to empty the vessel before adding Firefly CLEAN Lamp Oil. It doesnt have to be dishwasher clean. You can get even the purist fuel to smoke if the wick is too high or has been contaminated. BULK LAMP OIL 5-GALLON CONTAINER WITH SPIGOT: Included with every 5-Gallon container of Firefly Fuel is a spigot for easy refilling. Have it on hand before the next emergency or hurricane hits. This fuel has no shelf life when properly stored. Recommended for indoor and outdoor use. USE RECOMMENDATIONS: For use in liquid oil candles, oil lamps & hurricane lanterns that use a small wick. Safe for Indoor & outdoor use. Please read the reviews where folks give 1 star. They are not using the fuel as directed. An informed consumer is our best customer. Approved for use with Firefly Colored Lamp Oil Dye WHERE NOT TO USE - Not for use in table-top fireplaces, effusion lamps or catalytic lamps that require gel fuel or alcohol-based fuels. Firefly CLEAN Lamp Oil is NOT recommended for tiki torches or vessels using a wick larger than 3.6mm which is a little over 1/8 as it will smoke. (See Discussion Below)