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This hybrid has an engine that achieves 40-mpg in the city and 45-mpg on the highway, and saves gas by de-activating cylinders when they are not needed. In various cruising modes, the Honda Civic Hybrid can deactivate all of its cylinders with the electric motor alone powering the vehicle. This is in tandem with Honda’s variable valve system that allows cylinders to open and close for maximum performance and efficiency.