The Birth of a Titan: Titan Fuel Tanks was started in 2003 in response to the voices of diesel truck owners who wanted to go fartherâ€“ longer. Without fear, they wanted to be able to go where the nearest fuel station might be hundreds of miles away. Anyone who has towed a trailer knows what it does to your mileage know how far it will be until the next station, you will often end up at overpriced stations that know they can gouge you and get away with it. Our goal was simple; design a lightweight tank that would fit each vehicle perfectly, not impact cargo space and provide up to double a pickup's fuel range. The tank had to operate without interfering with any functional parts of a vehicle, including the hitch, and â€“ the real kicker â€“ it had to look good. Because the last thing we want is to make your vehicle something you would be less proud of. A chemical engineer introduced us to XLHDPE â€“ Cross-linked High Density Polyethylene â€” we knew right away that this was it. It's superior to the linear polyethylene used in original equipment tanks because the molecules of the polymer weave more tightly together (thus the term â€˜cross-linked'). The cross-linked molecular weave makes our fuel tanks stronger, safer, and more durable than most anything on the market. It allows us to confidently back each one with our unparalleled 5-year limited warranty. With the pieces in place, Titan extra-large-capacity, under-body replacement fuel tanks were born. Why TITAN Tanks Are the Best You Can Buy. The bodies of all TITAN Fuel Tanks are made of one remarkable material: High-Density Cross-Linked Polyethylene (XLHDPE). XLHDPE is one of those space-age materials which performs amazing feats; such as superior performance in any weather and in extreme hot or cold temperatures. With its seamless design, the TITAN Fuel Tank is one piece â€“ and very tough.