At the risk of sounding un-American, again I say, don't speed.
"Consider that speeding often doesn't save much time. How many times have you reached a red light, only to find a "jackrabbit" waiting there that passed you a half mile back like you were standing still? Ever wonder why? Around most urban areas, signals limit overall speeds to what the system can handle (in terms of numbers of vehicles). In Phoenix, for example, that's approximately 40 to 45 mph. Drive faster than that and you'll simply spend more time waiting at red lights, wasting fuel, wearing down brake pads, and accumulating just a little more stress in your life for no good reason or gain."
Exactly. I am often dangerously passed on Highway 62 only to end up right behind the offender at the 61/62 traffic light.
Add it up: little or no time saved, costly fines, higher insurance costs, greater chance of being injured or killed. Not a good deal.
COMMENT: "On an Interstate, where you truly can save some time by speeding (provided you don't get pulled over), the difference between 65 mph and 80 mph over 50 miles is only 8.7 minutes. Big deal."