What are the fuel policies for rental cars at SeaTac?

Detailed answer

The fuel policies for rental cars at SeaTac vary by company, but most companies have a standard policy that requires the vehicle to be returned with the same amount of fuel as when it was picked up. Some companies may offer a fuel service option, which allows the driver to pre-pay for a full tank of fuel and return the vehicle empty. Other companies may charge a fee for fuel if the vehicle is not returned with the same amount of fuel as when it was picked up.