I purchased a pulsar 135 LS in the year 2011. Since then I have been riding this bike with almost no issues at all. Fual consumption is average. At the earlier days I used to get mileage around 50 kmpl on average but later it got reduced to 45 kmpl on average.
This is good mileage if you consider the power and the style that you are getting with this machine. And I would like to mention the awesome balance that this bike has. The rear tyre is thicker and that gives greater balance to the bike. Balance is so good so you can ride the bike even during the monsoon without worrying.
Front disk is good for emergency and rear is average. You can use the rear drum brake when you want to stop your bike in the traffic, I mean when you have time in your hand to stop the bike; but for emergency situations do not forget to use the front disk brake. Seats are not at all comfortable. If you are riding for long time then you might feel back pain but good for shorter time. Front and rear seats are not soft at all so your girlfriend might complain about it if you go on long rides with your girlfriend. So you might need to modify the rear seat to make it more comfortable to seat. Overall it is good bike with good power you can reach till 100 kmph even if you are riding double. But if you want to get best of the mileage benefit then try to keep the speed within 30 - 45 kmph and try to ride smooth. It is good one to purchase value for money is there.