For now I use the Venom Speed Meter - which can be an accurate tool but soon as you get ANY wheel spin or anything like that it becomes way off.
Just so everyone knows, doing jumps will make it give in-accurate readings as well.
Anyways...
So far the best Ive got on my Tmaxx (which is pretty much stock) was 34mph, but it was like 25 degreees out and the engine was all out of whack. The best Ive got on my electric evader ST (using a 13turn motor) was 34 or 35 (it changes day to day [sm=confused.gif] ) but im hoping to break or get close to 40mph once I get some better batteries, change my gearing, and mess with the motor timing.
I havent checked any of my other cars (they have all been broke, missing parts, or I just havent had the time), but my best guess would be 20mph+ for my mini-t (geared for wheelies though), about 15mph for my durtrax MSF, and 50mph+ for my nitro evader BX.
Tommorow ill try to get a reading on the nitro evader, and once I get some tires for my mini-t ill see if I can clock it (might be too small for the radar gun to pick up?)
The MSF needs a receiver and some other parts so it will be a while before I can do anything with it.