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In Reply to: Actual MPG more than OBC indicates posted by Robert on December 16, 2001 at 19:58:05:
HTTP://home.iae.nl/users/bts/obc.htm
it contains the codes and instructions for accessing and refiguring the OBC. Try the UK E32 Register for more links.
Happy hacking
Al Stirling
89 730iSE
The ~14 mpg shown on the OBC for my 89 735iL is less than the ~18.1 mpg I calculate at fill ups. Doesn't anyone know why or how I can recalibrate the OBC reading. The OBC rate has dropped over the years.