There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A dynamic pressure compensation module receives the oxygen sensor signal and the pressure signal and to perform dynamic pressure compensation. The adaptor hole extends through the washer plate and the first and second projections. Storage of content across the first storage system and the second storage system is managed in accordance with a rule set. Each said float comprises a substantially flat and vertical wall allowing said floats to be installed in pairs with mirror orientation to each other with their said flat and vertical walls contacting each other, so each pair of said floats forms a hydrodynamically shaped hull.