The category was fuel economy (MPG or MPGe), the reviewer should have provided the Volt's MPGe rating (106MPGe combined) not the 42 MPG rating since the Volt can run entirely on battery for an estimated 53 miles. When using regular octane unleaded gas the 2017 Volt consistently meets or exceeds its EPA combined MPG rating of 42MPG.
As regards range, in actual use and not EPA testing the Volt can travel more than twice as far as the Bolt at a highway speed of 75mph (410 miles total (370 miles gas + 40 miles estimated range on battery at 75mph) for the Volt versus just 190 miles for the Bolt).
