how much fuel does using cruise control on a 91 camaro actually save on a 120 mile trip?

When purchasing a vehicle, consider buying the most fuel-efficient vehicle that will meet most of your needs, and rent a larger vehicle or a different kind for infrequent needs; a “hybrid” vehicle that combines a high-efficiency gasoline engine with an electric motor for greater fuel efficiency; fewer power options such as automatic transmission and especially air conditioner; 2-wheel drive if you really don’t need 4-wheel or all-wheel drive.