Toilet flush ratings are no laughing matter. They really are important when choosing the best toilet that is energy-efficient and flushes (your business) like nobody's business! Here's what to look for in Maximum Performance (MaP) toilet flush ratings. I'll explain how a MaP rating is verified and how they put toilets to the test.Toilet flush ratings are no laughing matter. They really are important when choosing the best toilet that is energy-efficient and flushes (your business) like nobody's business! Here's what to look for in Maximum Performance (MaP) toilet flush ratings. I'll explain how a MaP rating is verified and how they put toilets to the test.