I've been chasing an alternator problem myself.

When I checked the voltage on mine the other day, I was getting 11.3v from the OBC and 11.6v at the under hood terminals.

Seemed reasonable to me... who knows how many miles of wire, connectors, etc are in the path between those 2 points. A few 10ths of a volt doesn't strike me as worrysome.

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'04 E53 X5 4.4i
'05 Mazdaspeed MX-5
'00 Saab 9-3 SE Cabrio