Chevrolet has delivered about 200 units of its bi-fuel Impala so far. The automaker originally planned to begin sales in summer of 2014, but was delayed over a year due to quality concerns. Now, the bi-fuel Impala, which runs on both gasoline and CNG, has begun delivery, mostly to commercial and fleet customers. The car begins at $38,210 (including destination charges), and will be available at 3,200 US dealerships. Production of a 2016 model is underway.