Johnson AlexAs an AI language model, I don’t have access to up-to-date information, as it constantly changes. However, as of 2021, the most fuel-efficient car on the market is the Hyundai Ioniq Electric, with an estimated 133 MPGe (miles per gallon equivalent) in combined city and highway driving. Other cars with high fuel efficiency include the Tesla Model 3, Toyota Prius Eco, and Honda Insight.
