Good question, herher. I have been unable to find any numbers to help support my answer, but I would like to offer a guess. I think that public transportation probably uses the most energy. Between planes, trains, buses and subways there is a lot of fuel and electricity being used every day in every city all over the nation. Despite the fact that I think public transportation may be using the most energy, it is actually saving energy, since if it were not used, all of those people would be driving their own car and burning fuel.
Hope this helps!
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