The only difference I can identify is the thicker air at sea level as opposed to to my elevation at home. The alda actually adjusts the rack ever so slightly to allow more or less fuel for any given setting.
Then it adjusts automatically for the altitude driven based on the air pressure so my assumption is that it could be adjusted to balance a little closer to my elevation. Of course then at sea level the car may get too much fuel but the adjustment it makes is so minor I doubt you would notice the difference.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique