How many gallons of gas is left when the light comes on 2002 Chevy Tahoe?

There's no single answer to how many gallons of gas are left in a 2002 Chevy Tahoe when the low fuel light comes on. The amount varies depending on several factors, including driving style, and how well the sensor is calibrated. It's generally considered to be between 1 and 3 gallons. It's best not to wait until the light comes on to refuel.