Rocket efficiency scales infinitely with size.
[0] https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation
But bigger rockets can get closer to that theoretical optimum because some dead weight components remain fixed-size and because some masses scale with surface instead of volume. Rockets can scale better than linearly with size, but they will never exceed the rocket equation.
What am I missing here -- I'm sure I'm overlooking something.
¹ Superlinear because tank mass scales with a lower exponent than tank volume.
On the other hand, ten fuel tanks will mass more than a single fuel tank with ten times the volume.
