Here is an effective fineness ratio drag table published by Hucho.It is correct for both streamline bodies of revolution and elliptical bodies.
Hucho's example was a 1966 VW Beetle 1600.
You see that the lowest drag available (Cd 0.04) occurs at the higher Reynolds number,at the intersection of L/D= 2.5.
If the body is shorter it experiences separation-induced pressure drag.
If the body is longer it experiences increased surface friction drag.
Either one increases profile drag.
She's right in the 'sweet spot.'