I want a powerful bike with good mileage
The bike best suiting your preferences would be Yamaha FZS Fi version 2.0. The bike comes with a new design, resembling its old version but having a lot of improvements over the same. It gets an all new 149 cc engine using fuel injection as its fuel system, producing 12.9 BHP @ 8,000 rpm and 12.8 NM @ 6,000 rpm. It gets an improved 5-speed gearbox and comes with a better mileage than before. The new frame under the FZS version 2.0 is 3 kg lighter than the first generation, making it more quick and refined in terms of overall perfromance, side by side increasing the fuel efficiency to 40-45 kmpl. It comes with a price tag of INR 81,659.