I need a bike with good Mileage for daily use.

i have a bike yamaha fazer he gives a milege 30 km how to increase a milege my ride speed 40-50 km

Hi, its better to go for the reliable Hero Honda CD Deluxe. The bike has reliable 97.2 cc, Air cooled, 4–stroke, single cylinder, OHC, Digital CDi engine with 7.8 hp @ 7500 rpm of decent power and has 8.04 Nm @ 4500 rpm of torque and gives mileage of around 72 to 76 kmpl depending upon the riding style and conditions and has good resale value.

You can also go for the stylish reliable Honda Twister. The bike has reliable 109 cc, Air-cooled, 4-stroke, single cylinder, digital CDi engine with 9 hp @ 8000 rpm of power and has 9 Nm @ 6000 rpm of torque and gives mileage of around 64 to 69 kmpl depending upon the riding style and conditions and has good comfort in riding and handling and has good resale value.

Don't go for Bajaj and Tvs bikes. As both the company's bikes have style, power mileage and speed, but lacks engine reliability and has shorter life span and are not consistent performance bikes and has less resale value.
So first test ride the bikes and take a wise decision.

Go for the reliable Hero Honda Splendor Plus. The bike has reliable 97.2 cc, Air cooled, 4– stroke, single cylinder, OHC, Digital CDi engine with 7.8 hp @ 8000 rpm of power and has 7.95 Nm @ 5000 rpm of torque and gives mileage of around 68 to 72 kmpl depending upon the riding style and conditions and has good resale value.

Go for bajaj platina it is having very good mileage and low priuce and OK looks