Which one will be best in comfort and mileage. Gixxer SF 250 or Yamaha R15M?

As per your requirement, we'd suggest you go for Gixxer SF 250. The Gixxer SF 250 impresses is its ride quality. While the ride is on the firmer side, the bike does a good job of isolating the rider from sharp road edges and potholes. So while you do feel the road surface, you do not have to brace for any jolts to your spine over bad surfaces. The ride quality gets better as speeds increase on the Gixxer SF 250. In terms of handling, the Gixxer SF 250 does not feel as light on its feet as the previous Gixxer SF 150. However, it does well to mask its weight especially when you are riding it in the city, where it feels almost effortless. The SF 250’s steering does feel a bit lazy and slow to change direction but when you are leaned into corners, the Gixxer SF 250 feels planted. Overall, the Gixxer SF 250 feels quite friendly and stable in corners even in wet and slippery conditions. Moreover, we would suggest you to take a test ride before making the final decision. Follow the link and select your desired city for dealership details.