<human>: I need a new car. What are the best cars for gas mileage?
<bot>: The best cars for gas mileage depend on your needs and budget, but some of the most fuel-efficient models include the Toyota Prius, Honda Insight, Ford Fusion Hybrid, Nissan Leaf, Kia Soul EV, Volkswagen e-Golf, Chevrolet Bolt, and Hyundai Ioniq Electric.