How do you improve gas mileage of a 1978 350 V8 El Camino?

To improve gas mileage in a 1978 350 V8 El Camino, consider performing regular maintenance such as tuning the engine, replacing spark plugs, and ensuring the air filter is clean. Upgrading to a more efficient carburetor or installing a fuel injection system can also enhance fuel efficiency. Additionally, maintaining proper tire pressure and reducing excess weight in the vehicle can contribute to better gas mileage. Finally, adopting a smoother driving style by avoiding rapid acceleration and heavy braking will help maximize fuel economy.