Q. Can TBX350 ride 700 kilometers in a single stretch with an average speed of 80 kmph in highway - Thunderbird 350X?

Considering this to be a hypothetical question I would say our body is also a machine, which needs breaks and time to revive and recharge. Same thing is with bikes. 700 km in a stretch is not a big deal. If you maintain the average speed of 80 KM per hour and considering you're not stopping for any breaks. 20 lt of fuel capacity and 35 KMPL is the average, also if are willing to ride it for 9 hours continuosly then yes it is achievable but not advisable. You need to enjoy your ride , you're going to enjoy it more when you take significant breaks.

Yes,For Sure.I have driven it from Patna To Sikkim which is 470 kms,after this much drive also my back was not complainting.But It will give you some nice amount of vibes on your hands if you rev it hard.If you want a powerful cruiser go for Royal Enfield Intercepter 650 or Bajai Dominar.P.S-You Should wait for BS-6 Complient Engine Thunderbird as it will come with lots of essential improvements and hopefully increased power figures

If you are good rider easily you can cover this distance in a single stretch and single fuel filling, but TB 350 is more relax for long ride rather than TB350X