Bike with good mileage and suspension under 65k to 85k

There are so many bikes released with latest technology so you can get as desired. You may try Honda series bike, Hero too came with nice splendor series, Bajaj latest CT 100 or Platina too goes fine, Yamaha's latest one.

I feel Honda Unicorn / Shine or Stunner would be perfect for your budget and choice.

The next one is, I prefer Hero Splendor and the last one is Bajaj series. You may try to check couple of branded bikes and then decide accordingly.

List of Bikes Under 60000-80000
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Bajaj Pulsar 180NS which is around 80-85k with 178 cc and 40 kmpl
Bajaj Avenger 150 which is around 75-80k with 149 cc and 45-50 kmpl
Yamaha FZ-Fi which is around 75-85k with 149 cc and 40-45 kmpl
Yamaha Fazer which is around 75-80k with 153 cc and 40 kmpl
Honda CB Unicorn 160 which is around 70-75k with 153 cc and 50-55 kmpl
Honda CB Trigger which is around 65-75k with 149 cc and 50-55 kmpl
Suzuki Gixxer which is around 70-75k with 150 cc and 45-50 kmpl
Hero cbz Xtreme which is around 65-70k with 149 cc and 50-55 kmpl
Bajaj Discover 150 which is around 50-55k with 149 cc and 55-60 kmpl
Tvs Apache 160 which is around 65-70k with 160 cc and 40-45 kmpl