The 2026 Toyota Prius is reported to be the most efficient hybrid car, with various trims available. However, it is unclear how its fuel efficiency compares to other hybrid models, such as the Toyota Camry Hybrid, Hyundai Elantra Hybrid, and Honda Civic Hybrid, as some outlets suggest the Camry Hybrid may also be a top performer in fuel efficiency tests. The Prius' exact mpg has not been specified, but it is being considered among the best cars for gas mileage in 2026.