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Re:Miles per Gallon by unwind on Thursday May 07, 2015 @08:44AM (#9504601)
This is probably the kind of trough that's meant: http://en.wikipedia.org/wiki/Watering_trough, detailed image: http://en.wikipedia.org/wiki/Watering_trough#/media/File:Cat....

If you "think away" the actual trough and keep only the liquid, you get the cuboid that the text is referring to.

Re:Miles per Gallon by kalleboo on Thursday May 07, 2015 @09:21AM (#9504815)
The kind of trough imagined in the article is actually precedented - although to replenish water and not fuel http://en.wikipedia.org/wiki/Track_pan