Sud i go for pulsar 150cc,and what s the fuel efficiency in it?

Hi, Bajaj Pulsar 150 DTS-i gives mileage of around 48 to 58 kmpl depending upon the riding conditions and style.
Bajaj Pulsar bike models has style, power and pick up, mileage and speed but lacks engine reliability and has shorter life span and are not consistent performance bikes and has less resale value. So better go for Honda Unicorn at any cost.
So its better to go for the new Honda Unicorn, Yamaha SZ-R, Yamaha FZ-S, Hero Honda Cbz Xtreme and Hero Honda Hunk which are the best reliable 150cc bikes currently in India. So think about and take a wise decision.

go for pulsar 100 cc.. 150 km mileage

Go for it if you like it. It will give you between 50-65 kmpl depending on traffic conditions and the way you ride it.