What are the symptoms of poor automotive fuel quality?

[ClaraMarie]

Symptoms of poor automotive fuel quality include: 1. Sluggish acceleration response and lack of power when climbing hills; 2. Increased fuel consumption; 3. Black soot deposits in the exhaust pipe; 4. Increased cylinder wear. Methods to identify fuel quality are: 1. Observe the color: Standard fuel appears golden yellow or colorless and transparent. Fuel that is cloudy, black, dull, or contains suspended particles is of poor quality; 2. Shake test: Shaking gasoline will produce bubbles. The faster the bubbles disappear, the better the fuel quality, and vice versa; 3. Touch test: Qualified gasoline is highly volatile and feels cool to the touch. Slow evaporation or noticeable residue indicates poor fuel quality; 4. Smell test: Qualified fuel has a faint aromatic odor. Poor-quality fuel may have a weak odor or strong, unpleasant, pungent, or sour smells, and the exhaust emissions may also have an abnormal odor.