When it comes to older trucks with good gas mileage, several models stand out for their fuel efficiency. The Toyota Tacoma, known for its reliability and versatility, offers decent gas mileage for a truck of its size. The Ford Ranger, particularly the models equipped with the 2.3L EcoBoost engine, also provides respectable fuel economy.

The Chevrolet Colorado and GMC Canyon, especially the diesel variants, offer solid mileage for their class. Additionally, the Honda Ridgeline, known for its car-like handling, delivers competitive gas mileage. It's worth noting that gas mileage can vary based on factors such as engine size, transmission type, and driving conditions. Considering these factors, these older trucks are known for their balance between fuel efficiency and truck capabilities.