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05-25-2012, 07:52 AM
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Moto GP Star
Join Date: Nov 2008
Posts: 11,022
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Not sure how official; it is but mythbusters did a test as well. Bikes used less gas and emitted less co2 but emitted up to 3000% more carbon monoxide and a few other gasses. It may get better with soem newer bikes with cats on them though.
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