No power and high fuel consumption

Question edited for clarity and MAKER!
Question moved from Cars and Trucks to model category.

Stated fuel consumption figures by the maker are seldom correct. You are driving in traffic and even changing gears! Figures are often given driving on the highway in top gear at 50 mph for 50 miles. When they say mixed driving, that is 5 miles to get to the highway and 45 miles on the highway. As long as the bike is running right, your tyres are at the right pressure, your brakes aren't binding and your spark plugs are a nice honey colour and not Black, fuel consumption is what it is. If you are 300 pounds, that will reduce consumption really badly.

https://www.fuelly.com/motorcycle/yamaha/mt-03

https://www.google.com/search?q=Yamaha+MT-03+660cc+Fuel+Consumption

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The size of the crown wheel gear. Ford 9 inch is a strong diff used in V8 models. The 8.8 is slightly smaller but is still a good diff. The gear ratios will probably be different. Manual gearbox cars have different ratios to automatics. The higher the ratio, the faster takeoff you will have but lower terminal speed. At high speeds , the high ratio differential will cause high engine revs and poor fuel consumption. A low ratio will be mediocre takeoff but allows high top speeds and lower engine revs. (Good for fuel economy if you are mostly highway driving)

when you start up the bike what is the tacho showing

Bear in mind that even without the engine running there may be a number of things drawing power:

The ignition coil will be powered up
Does the bike also have permanent running lights on as soon as the ignition is engaged?
Your neutral light will be on (only .2 of an amp)
Does the bike have an electric fuel pump?

All these things may add up. You are only drawing about 25 watts, which is the power it takes to illuminate a brake light.

While I don't have data on the power consumption, it doesn't seem that excessive

sounds like you clutch is slipping may need adjustment or replacement

Not much to go on here. Power loss in a high gear would likely be attributed to carburetor. No bike, no year, no info, little tough to help you. The throttle would likely be fairly wide open in 6th gear where the bike would have the least power and would be calling for gas and probably not getting enough- or possible to little/too much air. Either way if runs in lower gears it isn't likely to be plugs or ignition, timing, valves or other obvious mechanical stuff.

in this high a gear, and with the small cc of the bike, and age of it ,it just doesnt have enough torque in that gear unless you are going very fast. nothing is wrong, just save that gear for when you are going real fast

Sounds like you need the carbs cleaned and synchronized, then the idle set once the bike warms up. May also have a cracked intake boot, or a vacuum line off.

Hi
there is no overdrive buttone in VW.
Seems like you need new clutch.

u may face with a gear pro. transition from a low gear to high gear cause a high consume in your machine.