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I know percentage calculations are difficult I am not master either. 0,3 units from 17,5 average is 17,4 to 17,7 which means tolerance/error was +-0,8%.
Other direction 13,5kWh no error.
My front tire deflector change time is under 5 min per swap. On that time car wont cool down much and conditions dont change too much to have effect if they are steady to start with.
Again if you do longer tests you will get more variation from temperature and wind as its rarery steady and other cars. My todays 100km test was ruined by other cars at 30km point...
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