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Old 01-08-2008, 08:57 AM   #2 (permalink)
Daox
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Join Date: Dec 2007
Location: Germantown, WI
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CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

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I use synthetic gear oil in my Matrix. However, the previous owner put it in. I'm going to be switching out to synthetic on my Paseo too as soon as its warm enough to do some work on it again. However, its more of a longevity thing IMO. I'm sure there is a slight effeciency increase, but I'd be willing to bet that the increase is so small you'd never know. I work in the power transmission industry (not an engineer, but I work with them) and we don't use synthetic to increase effeciency. We do use synthetic to increase life of our gearboxes and the load bearing capabilities of them.
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