Guys, there is no reason to take such risks. I have "preached" to you all about this before. The BEST alternative to risking life and limb, or at the very least serious jail time, are sanctioned events out West called Open Road Races. Sure, it may be far away from where you live, but it is completely LEGAL and immensely safer than doing a speed run on a public road. Open road races are also held on "public" roads, rural highways really, but they are CLOSED to the public and the police actually set up road blocks so we can play safely without worrying about other traffic on the road. These are thoroughly well organized events and the organizers enforce strict safety requirements.
The reason this sport is so much better than anything else is you will have an opportunity to get your car up to VERY HIGH speed and SUSTAIN over a continous running distance of up to 90 miles.
Good thing they are any longer because at high speed your mpg drop to single digits.
There is no way your going to find a road course at any race track where you can SUSTAIN an average speed over 140 mph. That is where open road racing comes in.
Unfortuantely, this type of "racing" ain't cheap. The entry fee can be as much as $595 per car. Sadly, these events are dying from lack of interest this year (another sign of a failing economy). Next month's event called the Pony Express has been cancelled due to insufficient number of entries.
For more detailed info, including safety regulations and other entry requirements go to:
www.openroadracing.com and check it out.