TOPIC:

Hi my 79 Kz1300 just put it on the road fill the tank and got 84km fill it again and only got 56 km what mileage should I be getting and can someone point at the right fix thanks Crash

First place I would be looking is the carbs, they are noted for flooding. I had to disassemble mine about every 2 years and go right through them and replace the needle and seat and often the floats to keep them going well.
I'm not sure if you already know but ALWAYS turn the fuel off when you stop or the #1 cylinder can fill with fuel when left on the side stand and hydraulic when you try to start it with disasterous results

Gee's- that is alot of fuel going somewhere- if the bike is running right you should be getting 4 times that mileage.
I think Rick is right- start with the fuel leaking on the ground./ fuel tap/ carb float valves.