  We evaluate the effect of inhomogeneity energy on the expansion rate of the
universe. Our method is to expand to Newtonian order in potential and velocity
but to take into account fully nonlinear density inhomogeneities. To linear
order in density, kinetic and gravitational potential energy contribute to the
total energy of the universe with the same scaling with expansion factor as
spatial curvature. In the strongly nonlinear regime, growth saturates, and the
net effect of the inhomogeneity energy on the expansion rate remains negligible
at all times. In particular, inhomogeneity contributions never mimic the
effects of dark energy or induce an accelerated expansion.
