What is one disadvantage of using a full-size spare tire?

Using a full-size spare tire does indeed come with the disadvantage of increased weight. A full-size spare tire is typically the same size and weight as the regular tires on the vehicle, which means it can add significant weight to the vehicle, especially when comparing it to a smaller, compact spare. This added weight can affect the overall handling and performance of the vehicle, particularly in terms of fuel efficiency, as the engine may need to work harder to move the extra weight.

Additionally, the space required for storing a full-size spare can lead to design and efficiency concerns. Automakers often design vehicles with compact spare tires to save weight and space, so including a full-size tire may not be practical in all vehicles. Furthermore, the additional weight may also lead to challenges in rotating the tires properly and managing tire wear across all four tires.