  A convincing explanation for the nature of the dark energy and dark matter is
still missing. In recent works a RG-improved swiss-cheese cosmology with an
evolving cosmological constant dependent on the \sch radius has been proven to
be a promising model to explain the observed cosmic acceleration. In this work
we extend this model to consider the combined scaling of the Newton constant
$G$ and the cosmological constant $\Lambda$ according to the IR-fixed point
hypothesis. We shall show that our model easily generates the observed recent
passage from deceleration to acceleration without need of extra energy scales,
exotic fields or fine tuning. In order to check the generality of the concept,
two different scaling relations have been analysed and we proved that both are
in very good agreement with $\Lambda$CDM cosmology. We also show that our model
satisfies the observational local constraints on $\dot{G}/G$.
