The information regarding the mileage and the maintenance cost of the bike can only be shared to you only by the nearest authorised service center. We would suggest you to visit the nearest authorised service center for further assistance.Click here for the Dealership: https://https://www.zigwheels.com/bikes/dealers/Triumph
In terms of performance, both bikes are equally powerful and have the same torque. The bikes differ on their design, cosmetics and features offered in them. For a detailed comparison, follow the below link - Compare. Moreover, you may have a test drive of the cars for a better idea of comfort and drive quality by visiting the nearest dealer in your city. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Dealers.
Triumph has hit the nail on the head by making the Speed Twin the most accessible big Bonnie. If your sole objective is buying a fast, classic motorcycle to hit the circuits or the twisties on a regular basis then this is the bike for you. Items like the round fuel tank, round headlamp, single bench seat and minimalistic mudguards are reminiscent of the classical roadster styling. Since it is a special bike to have it has been plunged with Diablo Rosso IIIs tyres for a better grip on the road. The posture is sporty with a slight forward lean towards the flat, wide handlebars. Al this package justifies the price it has been offered.