To find the exact capacity, you need to specify the *exact make and model* of the 2006 Chevy. You can usually find this information:
* On the driver's side doorjamb: A sticker there often lists the vehicle's specifications, including fuel tank capacity.
* In the owner's manual: This is the most reliable source.
* Online: Search "[Year] [Make] [Model] fuel tank capacity" on Google or a similar search engine.
Without knowing the specific model, I cannot provide the correct answer.