I heard all sorts of things. Here is the correct info to the the best of my knowledge. Rubicons come with stiffer springs that make them sit a bit higher. I heard all sorts of conflicting info on how much higher that from local 4x4 shops, tire stores, and at this forum.
Finally, in exasperation, I drove my Rubi to the local Jeep car lot and measured ground clearance to body just behind front fender.
My Rubi with stock springs sat 0.75" higher than a non-Rubi. I ran 33 X 11.5 tires for an entire year with no lift and it never rubbed anything, except a bit on swaybar when turning to full lock.
So based on my actually measuring my Rubi and a Sport of similar model year, and taking into account difference in tire size, I found the Rubi suspension goes apparently give about 0.75" of lift, apparently due to stiffer spring rates. Technically that is not a lift, but it does sit higher in regard to suspension, plus more additional height from tires.
So if you installed a 2" aftermarket lift, you'd be 2" higher than a stock non-Rubi, which would be 1.25" higher than a stock Rubi suspension.
For another example: If you installed a 3" aftermarket lift, you're Wrangler would sit approx 3" higher than a stock non-Rubi, which would be 2.25" higher than a stock Rubi suspension.
I'm talking suspension height above. Any difference in tire height would be additional change in height.