> Hmmm... last I checked walking and
> riding a bicycle did not use any gallons.
>
> Joe M.

True... It's a measure of energy usage converted to miles per gallon for
ease of comparison.

Harold


>
> Harold Hallikainen wrote:
>> There's a lot of interesting info at
>> http://en.wikipedia.org/wiki/Fuel_efficiency_in_transportation. A few
>> numbers from there (passenger miles per US gallon):
>>
>> Boeng 7447-400: 91
>> walking: 228.1
>> bicycle: 630
>> cruise ship: 13.9
>> freight train: 457 ton-miles per gallon of diesel fuel
>> full commuter bus: 231
>> commuter bus with 9 passengers: 54 (could drop to half with many stops)
>>
>> Harold
>>
>>
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