give me good suggestion

Assuming it's working almost as well as when it just left the showroom... you can go to a performance workshop that has a dyno & tell them what you want from your bike. They might suggest you have the exhaust system modified, some of the sensors altered or change the chip in your engine computer. This will also depend on your budget. If you go to a workshop that has a dyno, they can actually test it properly & you can see the benefits before you pay.

1.You have to maintain the constanst speed everyday, 2.regular checkups and serving. 3.Don'g give your byke to others. 4.Don't give lift morethan oneperson(even your friends also). 5.Don't ride stylishly. Be cool and safe drive. If you follow these condition you can automatically improve your byke mileage and it should be run in well condition.