Among the Royal Enfield motorcycles, the models that generally offer better mileage are the ones equipped with the company's new generation engines, known as the "UCE" (Unit Construction Engine) series. These engines are designed to provide improved fuel efficiency compared to the older cast-iron engines.
In terms of mileage, the Royal Enfield Classic 350 and Royal Enfield Bullet 350 models equipped with the UCE engines are often considered to be more fuel-efficient compared to other models in the Royal Enfield lineup. These motorcycles can deliver mileage ranging from around 35 km/liter to 40 km/liter under normal riding conditions.
It's worth noting that the actual mileage you achieve can vary based on various factors such as riding style, traffic conditions, road terrain, and maintenance practices. It's always a good idea to refer to the manufacturer's specifications and consult with Royal Enfield dealers or existing owners for more accurate information and real-world experiences regarding mileage.