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Old 03-20-2009, 02:24 PM   #6 (permalink)
ConnClark
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Join Date: Jun 2008
Location: Richland,WA
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
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It would depend on the efficiency curve of your alternator and the one your considering upgrading too. A larger alternator might have a larger coil current and thus more parasitic drag on the engine. Then again the increased heat on your stock alternator might increase copper losses and drop its efficiency.
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