andrew strasfogel wrote:
1/2 degree = h.m. mpg?

Not linear. Never tried to accurately measure it. Have changed chain and mpg improved by 5+% but the numbers I've seen are ALL over the place. Too many variables. I have moved the actual pump timing of a well running engine by almost 4 degrees and seen ABSOLUTELY no difference in fuel economy. In an engine not running nearly so well, a change of 2 degrees resulted in detectable improvement in fuel economy.

Marshall
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          Marshall Booth (who doesn't respond to unsigned questions)
      "der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi

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