GM ASEP Steering and Suspension Practice Test 2026 – Complete Exam Prep

A mismatch in tire pressure across the tires can lead to several detrimental effects on a vehicle's performance and efficiency.

Firstly, when tire pressure is uneven, it creates an imbalance in the vehicle's handling and stability. This can compromise the vehicle's overall traction and control, which may feel akin to a loss of power since the vehicle will struggle to respond effectively during maneuvers or when accelerating.

Additionally, improper tire pressure directly impacts fuel economy. Tires that are under-inflated can create more rolling resistance, which forces the engine to work harder and consequently consume more fuel. On the other hand, over-inflated tires can lead to a smaller contact patch with the road, also affecting fuel efficiency negatively.

Furthermore, misaligned tire pressures can cause uneven tread wear. Tires that are consistently under-inflated or over-inflated will wear at different rates, leading to decreased tire life. For instance, the edges of under-inflated tires tend to wear down more quickly, while over-inflated tires may wear excessively in the center.

Considering these factors, a mismatch in tire pressure can lead to loss of vehicle power, poor fuel economy, and increased tread wear, making "All of the above" the most comprehensive and correct answer