The Benelli TNT 25 and BN251 both offer a powerful punch in terms of engine performance, but they differ in terms of spec and design. The TNT 25 is powered by a 249 cc single-cylinder, 4-stroke engine that produces 26.2 bhp of power and 21.7 Nm of torque. It features an alloy wheel, dual-channel ABS, and a 5-speed gearbox. 

The BN251, on the other hand, is powered by a 250 cc single-cylinder, 4-stroke engine that produces 27.1 bhp of power and 22.3 Nm of torque. It features an alloy wheel, dual-channel ABS, and a 6-speed gearbox. TheBenelli TNT25 also offers better mileage compared to the BN251. It is estimated to deliver around 35 km/l in city and 45 km/l on the highway, while the BN251 can deliver around 30 km/l in city and 40 km/l on the highway.