Take a look at the specs of the Dahon Speed D7 (chromoly) and Vitesse D7 (aluminum). Unless I'm mistaken, the components are pretty much identical, and the frame is the same design. The Speed is listed at 26.6 lbs and the Vitesse at 24.9. There are hi-tensile folders with frames that look very much like the Speed and the Vitesse. However, their components are usually not as good, and heavier.
http://www.dahon.com/us/speedd7.htm
http://www.dahon.com/us/vitessed7.htm
Here's one example of a hi-tensile clone. Specs read 34lbs "complete" (I don't know what "complete" means relative to the Dahon specs).
http://www.bazookasports.com/viewpro...&details=specs