This is a good read. These guys take there testing seriously.
https://www.seriouseats.com/2013/03...oYC0F8GnkfqE2VnXbOA3lajbzqNRVi8lT3AOFUlv63PL4
https://www.seriouseats.com/2013/03...oYC0F8GnkfqE2VnXbOA3lajbzqNRVi8lT3AOFUlv63PL4