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A conventional fuel system serves no purpose after converting to CNG, so Mark removed the original fuel tank to save weight. These two tanks mounted in the GTO's trunk effectively store CNG, which is pressurized to 3,600 psi. Lincoln Composites produced these particular tanks, which consist of an aluminum shell wrapped by carbon fiber. They weigh just 80 pounds each-nearly half that of a traditional steel tank-and were installed by Phoenix Energy Corporation.