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Old 10-18-2009, 07:35 PM   #7 (permalink)
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Join Date: Aug 2008
Location: The Wet Coast, Kanuckistan.
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The Golden Egg - '93 Toyota Previa DX
90 day: 31.91 mpg (US)

Chewie - '03 Toyota Prius
90 day: 57 mpg (US)

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There is a study in your list, Tasdrouille, that shows an advantage for synthetics in a diesel engine.

It's small (10% less friction for the best synth over the base non synth) but every bit counts. This study does not test for cold performance which possibly would give greater returns.
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