Gasoline stored in a gas can typically remains usable for about 6 months to 1 year under proper conditions without additives. After this period, it begins to degrade due to oxidation and evaporation, which reduces its combustibility and can cause engine problems

. Using a fuel stabilizer additive can significantly extend the storage life. With stabilizers like STA-BIL, gasoline can last up to around 2 years or even slightly longer if stored optimally in sealed, airtight containers away from heat, sunlight, and moisture

. Key points for storing gasoline in a gas can:

• Use high-quality, approved plastic or metal containers that are tightly sealed to minimize oxygen exposure

• Store the can in a cool, dry, and well-ventilated area away from direct sunlight and heat sources

• Avoid storing partially full cans; fill them completely to reduce air space and oxidation

• Label the gas with the date of storage to track its age

• Rotate stored fuel every 6 to 12 months by using it in a vehicle or equipment to keep fuel fresh

• Replace gas cans every 5 years or sooner if damaged to ensure safety and integrity

In summary, without stabilizer, gasoline in a gas can lasts about 6 to 12 months; with stabilizer and ideal storage, it can last up to 2 years or slightly more. Beyond that, fuel quality diminishes, and it is safer to replace or dispose of the gasoline properly