Focbox Unity App Displaying Wrong Speed

Had this issue since day one with my focbox app/raptor 2.1

See the screenshot I attached. When I max the speed on my raptor with the wheels off the ground it only displays 39km/h. Shouldn’t it show something more like 50? I think something is going wrong with the measurement of distance somewhere because I get the Wh/Km reading up wayy too high

how do I solve? @carl.1

Screenshot_20190824-121210

That’s normal with the raptor

why is it so inefficient??