Huh?
Okay, youse got this one plane in the middle that is saving, what? a little bit of fuel? Then you gots these four planes in front that are all using a lot of fuel because they is blasting through the friction and all dat. On tops of dat, youse got five planes flying when all you needs in one.
How does that save fuel?
aerodynamics
Drafting or slipstreaming is a technique where two vehicles or other moving objects are caused to align in a close group reducing the overall effect of drag due to exploiting the lead object's slipstream.Wikipedia
Even if there is an 'explanation' it's still a stupid idea - for too many ways to bother listing...