I have to assume that what Ash says is correct as I don't really know any better (if you can understand his grammer...) To compare elec motors to real cars for a minute, heres another way of looking at it: A single turn motor has lots of bhp (think formula 1), where a quad turn motor has lots of torque (think bus...). For buggys you will have no problem with a single turn motor due to low weight and efficient drive trains, but if you're running something different (ie those silly climb up cliff slow as f*$k 4wd things) then you're gonna need all the winds you can wrap around. I think that may just bore you into nitro power, but never mind!
edit: I don't really think a double is more economical than a single, just a different way of delivering the power.
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