Yes, some v twin are narrow or as narrow as a single, but such narrowness in regards to the frontal area is mostly totally wasted when the rider is wider than the bike anyway.
I remember the Ducati 851 were as wide as a four of the era as they crammed the batteries and other Gubins on the side to enable them to get a decent amount of weight on the front wheel.
A narrow angle V can get the weight further forward. But Regardless of how narrow you make the bike. The human is a certain width.
the most slippery shape is a teardrop that has the blunt end facing forward. Like a dustbin fairing
Thats my 1 cents.
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