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What is true about motorcycles being efficient applies to bicycles even more. A bicycle uses even less material and lubrication. Motorcycles are a good option if you solo commute more than 25 miles and live in a warm climate. The 125cc motorcycle and the school bus are widely used in Third World countries. In temperate regions car pools and buses are efficient when wind chill factor makes riding a motorcycle uncomfortable. For those of us in rural areas a bio-diesel truck or van is useful. Now if we can just get a multi-cylinder diesel motorcycle that gets 500 mpg highway for under $10,000 USD.
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