I have already done some tests. I used a flywheel and let it run for 2 hours at a speed of 17.6 km / h. The remaining battery capacity was 89%. Then I made the wheel 1kg heavier and repeated this test. The remaining capacity was then 90%. So 1% difference. This could be more because it is a completion.
I also did a test to see if the temperature has an influence on the range. I spun the wheel for 5 hours at a speed of 17.6 km / h just like I did in the previous test at 20 ° C. The remaining capacity was 76% and then I repeated the test at 2.5 ° C and the remaining capacity was 72%, so a difference of 4%. So my conclusion is the lower the temperature, the smaller the range.
I think these are good tests after all. What do you think?