The straddle vehicle includes a front wheel, a rear wheel, at least one tank, an internal combustion engine, a seat, and a steering handle. The front wheel is a steering wheel. The rear wheel is a drive wheel arranged located rearward of the front wheel. The tank is configured to be filled with a gaseous fuel. The internal combustion engine generates power using gaseous fuel filled in the tank. The driver sits on the seat. The driver performs the steering operation to the steering handle. The center of gravity of the tank is located closer to the steering wheel with respect to the center of gravity of the internal combustion engine.

A tank arrangement, wherein the fuel tank body comprising a main portion and a secondary portion which comprises an upper portion and an intermediate portion arranged successively along the vertical direction, configured to define a housing to accommodate the urea tank, wherein in an engaged configuration, the urea tank is arranged under the upper portion of the secondary portion along the vertical direction, in abutment on the intermediate portion along the transverse direction, and in abutment on the primary portion along the front-rear direction, wherein the urea tank comprises a urea drain on a lower portion of the urea tank along the vertical direction, the secondary portion of the fuel tank comprises a groove that extends through the fuel tank along the transverse direction, adapted to allow ducts to go through the secondary portion of the fuel tank along the transverse direction to be connected to the urea tank.