One of my best friend have ktm duke 250 2017 first I tell you about his mileage ktm duke 250 mileage is 40 km pr liter its good mileage after seems his speen overall ktm duke 250 2017 is good mileage if I come toh its comfort then ktm duke 250 comfort level is average because its second seater person is not comfortablly sit on bike if I come to its reliability its body is not strong mostly body made by plastic that is negative point on it if I come to its road grip then ktm duke have a amazing road grip its very easy to control bike overall this bike performance is very good and its a sport bike its look amazing if u want a sport bike then you can buy it thank you