  We present an implicit-explicit finite volume scheme for two-fluid
single-temperature flow in all Mach number regimes which is based on a
symmetric hyperbolic thermodynamically compatible description of the fluid
flow. The scheme is stable for large time steps controlled by the interface
transport and is computational efficient due to a linear implicit character.
The latter is achieved by linearizing along constant reference states given by
the asymptotic analysis of the single-temperature model. Thus, the use of a
stiffly accurate IMEX Runge Kutta time integration and the centered treatment
of pressure based quantities provably guarantee the asymptotic preserving
property of the scheme for weakly compressible Euler equations with variable
volume fraction. The properties of the first and second order scheme are
validated by several numerical test cases.
