In Ford Motor Co. v. Ridgway, 135 S.W.3d 598, 47 Tex. Sup. Ct. J. 266 (Tex. 2004), the supreme court found that circumstantial evidence of the source of a vehicle fire provided no evidence of a manufacturing defect. Id. But the court's determination centered on facts not present here: the truck had been driven 54,000 miles by previous owners who had modified and repaired the truck, the plaintiff testified only that a fire occurred, and the expert testified that he suspected the electrical system was to blame and could not rule out the fuel system as a cause. Id.