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The amount of fuel the 2003 Chevy Silverado 1500 truck can hold depends on the model you have. The regular models have a tank capacity of 26 US gallons, while the models with a long bed have a larger tank holding 34 US gallons. The truck runs well on regular unleaded gasoline with an octane of 87 or higher, but you can use premium fuel if you prefer to prolong the truck's lifespan.
The fuel capacity of the gas tank in your 2003 Chevy Silverado ranges from 26 to 34 gallons.
My 2003 Silverado with an extended cab, a bed length of 6.5 feet, and a 5.3 liter engine is equipped with a 26 gallon fuel tank.
I have a tank that can hold up to 35 gallons.