  We report the experimental observation of commensurability oscillations (COs)
in 1D graphene superlattices. The widely tunable periodic potential modulation
in hBN encapsulated graphene is generated via the interplay of nanopatterned
few layer graphene acting as a local bottom gate and a global Si back gate. The
longitudinal magneto-resistance shows pronounced COs, when the sample is tuned
into the unipolar transport regime. We observe up to six CO minima, providing
evidence for a long mean free path despite the potential modulation. Comparison
to existing theories shows that small angle scattering is dominant in
hBN/graphene/hBN heterostructures. We observe robust COs persisting to
temperature exceeding $T=150$ K. At high temperatures, we find deviations from
the predicted $T$-dependence, which we ascribe to electron-electron scattering.
