said by A non :This makes the average look good, but does little to help the people who are well below advertised.
When the average speed is 1.2X 15 = 18 mbps and the max is 20 mbps it means very few people are getting low speeds, since not everyone getting good speeds will get 20mbps all the time, some will get between 15-20mbps.
Verizon also sets it max higher and to get higher than advertised you have to set the max higher than advertised.