Hi; I am new in this forum. I was looking for such forum and at last reached to the right one. A question is in my mind, if we drive the bike within 60km/h range, we achieve a good mileage but beyond this limit, mileage drops drastically while we cover the distance in short time as compare with slow drive. The reason is (for me) the air, which pressure increases with speed? I want to know the graph of this increasing, mean want to know how much power we require to get more speed after 60km/h.