My hangar partner has a Pulsar XP with a 80 hp Rotex engine. With only him onboard he cruises at 141 Kts and 4600 RPM. He found that the plane will cruise at 120 Kts with 4200 RPM. He wrote a letter to the Washington FSDO (the local FAA cognizant office) reporting those parameters and stated his LSA intentions. He wanted to operate the aircraft as a LSA and not renew his medical. He never got a reply to his letter for several months. So, he called the FSDO; they said his letter was on file and not to expect any reply. The inspector also told him that the aircraft is registered as experimental and he could make any declaration regarding the aircraft. He made no aircraft log book entry and did not install any placards regarding the LSA operation. After operating for four years without a medical, he has had one ramp check without any further problem. Your results may vary.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA