Yeh, I don't know how all this stuff works.....
So here is a cut and paste of the text.
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I worried about the high altitude performance of the Savannah prior to purchasing my kit. I live in Denver, CO and fly out of Erie (KEIK) airport – elevation 5100 feet.
I completed the kit in June 2010 and now have about 50 hours on the plane. It is a Savannah VGW with a 100 hp Rotax engine. I use 91 octane Mogas. I flew it to Oshkosh in July without any problems.
I recently flew the Savannah round trip from KEIK to Leadville (KLXV – 9924 feet) located in the middle of the Rocky Mountains. I used "normal" techniques on all parts of the flight. No attempt was made to achieve maximum performance. I departed KEIK with full fuel (21 gals) and two adults (200 & 140 pounds). My plane weighs 633 pounds. Takeoff weight was 1099 pounds, well below the max gross of 1234. With calm wind, density altitude(DA) 7300 feet and one notch of flaps, the takeoff roll was ~400 feet.
I climbed to 14,500 feet to clear the Rocky Mountains (peaks at 14,000). Initial climb was ~600/min. Climb at 14,500 was ~100/min. Typical speed for my plane at 5200 RPM and 7000 feet is ~100 mph. Speed at full throttle (4900 RPM) and 14,500 was ~70 mph.
The take off at KLXV erased my worry about high altitude performance of the Savannah. KLXV has a 6400 feet long paved runway. With full fuel, two adults (1099 pounds) calm wind, DA of 11,300 feet and one notch of flaps my take off roll was ~600 feet. Initial climb was ~200/min.