(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.
MPG For Speed .com. Unfortunately, it's true. Your car's gas mileage decreases once it gets past its optimal speed. For most cars, this is around 55-60 mph. This means that every time you go over this speed, you're essentially wasting gas and money - and creating unnecessary greenhouse gases.
The U.S. Department of Transportation (DOT) set the ratings scale, shown below. 1  But tire makers test their own tires and assign their own speed ratings. On the sidewall of every tire, you'll find one of these speed rating codes: 2  M - Up to 81 mph. 3  N - Up to 87 mph. 4  P - Up to 93 mph. 5  Q - Up to 99 mph. 6  R - Up to 106 mph. 7  S - Up to 112 mph.