The G2X data was gathered in 2006 at our (then annual) Street Challenge event held at Putnam Park Road Course (
http://www.putnampark.com/).
Steve, I know our data and the way you acquire yours are different and I DO NOT want to claim our data was acquired "Car and Driver" style. Ours was acquired on a road course, with a pro driver, on street tires (225 front!) At that time we hadn't done much data acquisition, and we were astonished with the numbers, so on the web they went.
Sometime in the near future I'd like to perform the average two-way test on some of our stuff and post those numbers. We just have to find the time, and the location.