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The narrow body also has the advantage of being shorter for the same Cd.
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I'd go with '...for the same fineness ratio.'
I know—pedantic.
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Another complication of outboard wheels apparently, is in crosswinds, there is more drag than with a single unified body.
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Does a solid wheel act like a rudder compared to a wire wheel? Does the wire wheel have lower crosswind drag? Just asking questions.
If the wheels are ahead of the stagnation point of the main body, the 'biplane' interference is halved; if they are behind the stagnation point one or the other is shielded from the crosswind by the main body.
I should do an illustration of the front fender that been rattling around in my head. It could apply to a lot of different situations. If I say 'baloney-cut Indian front fender' does that paint a picture?