I read from an article in Conde Nast Traveller that the toilets in commercial airplanes consume 1 liter of fuel/flush. Could this be? really? that is enough fuel to drive a car a few miles. Either this is total BS or Boeing engineers are secretly working with oil companies.

These 2 sites [1, 2] also reported the same ‘fact’. Caution: both sites are of the hippie-ultra-left variety. Looks like the source came from a chinese study tho. hmm…