* The Toyota Prius Prime: This plug-in hybrid electric vehicle (PHEV) has an EPA-estimated fuel economy of 133 MPGe (miles per gallon equivalent) in electric mode and 58 MPG in hybrid mode.
* The Hyundai Ioniq Plug-in: This PHEV has an EPA-estimated fuel economy of 134 MPGe in electric mode and 52 MPG in hybrid mode.
* The Kia Niro Plug-in: This PHEV has an EPA-estimated fuel economy of 105 MPGe in electric mode and 46 MPG in hybrid mode.
In addition to these production cars, there are also several prototype vehicles that have achieved even higher fuel economy ratings. For example, the Volkswagen XL1 has an EPA-estimated fuel economy of 261 MPG, and the Audi A2 Concept has an EPA-estimated fuel economy of 229 MPG.
It is important to note that these fuel economy ratings are based on laboratory tests and may not be achievable in real-world driving conditions. However, they do show that it is possible for cars to achieve very high fuel efficiency.
