(44) Public water system --A system supplying water to a number of connections or individuals, as defined by current rules and regulations of the Texas Commission on Environmental Quality, 30 TAC Chapter 290.
According to studies backed by the department of energy, the average car will be at its advertised MPG at 55 mph. But as the speed increases: - 3% less efficient at 60 mph. - 8% less efficient at 65 mph.
Speed ratings are based on laboratory tests where the tire is pressed against a large diameter metal drum to reflect its appropriate load, and run at ever increasing speeds (in 6.2 mph steps in 10 minute increments) until the tire's required speed has been met.