We could advertise a larger capacity, but we chose to only market usable capacity to set honest and reasonable expectations for our customers. The Titan XXL tank also features minimal hang down below the bottom of the stock tank (approximately only 1.5" lower).Installation is a breeze - no fabrication or cutting required. This tank is a direct fit, bolt-in application, making it the perfect upgrade for your Chevrolet Colorado/GMC Canyon. Application. For model years 2016-2022.For 2016-2022 Chevrolet Colorado/GMC Canyon with Duramax engines, Crew Cabs, and Long Beds (6.2).Note: For use with diesel fuel ONLY. Additional Details. The TITAN tank is 15 gallons larger at 36 gallons. The stock tank is only 21 gallons. Will not interfere with powered steps, air bag systems and most other accessories. Our mid-ship, direct replacement fuel tanks are designed to use your trucks' stock/OE sending unit. However, our tanks are compatible with Fleece, AirDog, FASS, etc.