  We systematically show that in potential driven generalized G-inflation
models, quantum corrections coming from new physics at the strong coupling
scale can be avoided, while producing observable tensor modes. The effective
action can be approximated by the tree level action, and as a result, these
models are internally consistent, despite the fact that we introduced new mass
scales below the energy scale of inflation. Although observable tensor modes
are produced with sub-strong coupling scale field excursions, this is not an
evasion of the Lyth bound, since the models include higher-derivative
non-canonical kinetic terms, and effective rescaling of the field would result
in super-Planckian field excursions. We argue that the enhanced kinetic term of
the inflaton screens the interactions with other fields, keeping the system
weakly coupled during inflation.
