Lear35 stuff
"When used by someone (toilet), everyone is glad that the pressurization provides a continuous airflow through the plane to the outflow valves."
Actually, the copilot gets the raw deal. There are two outflow valves in the Lear 35...the primary outflow valve, and the cabin safety valve. The primary is located near the copilot's feet up front, and the safety valve is on the aft bulkhead in the back of the cabin.
The primary valve is the one that's usually operating...the safety valve only opens when the cabin pressure differential reaches 9.7 psid, or if your squat switches are in the ground mode and the cabin air switch is off.
As for 800 lbs at your destination in a LR35....I agree, yikes! I flew to Travis AFB once, and the box said we'd arrive with 1200 lbs....we were sweating it, because all the nearby alternates weren't looking so good...Tahoe had heavy snow, Sacramento had thunderstorms, and SFO and OAK were also experiencing rain showers with intermittent t-storms. Looking back on it, we should have filled the trunk...at least then my gluteus maximus wouldn't have munched on the seat cushion as much...nothing like trying to get through some tough weather AND worrying about divert fuel.