In general, gasoline and diesel can be stored for 6 months to 1 year without significant degradation if they are stored in a clean, sealed, and dry container or tank, away from sunlight, heat, and sources of ignition. However, fuel that is exposed to oxygen, moisture, or contaminants can deteriorate more quickly, resulting in reduced quality, lower octane rating, and increased levels of sediments or sludge.

So yeah, the trope of hopping in an abandoned car after the zombie apocalypse does not work 😂