Other Fuel System Tank Mounting problems of the 2008 Chevrolet HHR

I bought this vehicle new. . . It is now 8 years old. . . 170,000 miles . . . It is driven in the northern IL area mchenry county . . . I put about 80 miles per day on the unit. . . For the past 4 months my fuel mileage has dropped from 26 mpg to 22mpg. . . So I tuned up the unit and the mpg remained the same. . . On 11-16-2016, I was driving down route 12 headed home ,my right rear tire sensor came on so I pulled into a best buy parking lot to check the tire, it might be going flat. As I was down on the ground looking for a nail in the tire , I saw a wet spot on the pavement in front of the left rear tire. . . I went there to check out what that might be and it was fresh gasoline. . . Then looking under the vehicle I saw a pulsating flow of gas coming from the steel fuel line mounted to the bottom of the floor at a plastic retainer holding 2 fuel lines coming from the fuel tank headed to the engine along with 2 brake lines. . . I drove the Hhr home and inspected the fuel line carefully. . . It was rusted completely thru inside the plastic line retainer. . . The retainer seems to be the problem. . . It catches and holds road salt inside the retainer. . . It took 8 years to rust completely thru the fuel line. . . A great fire hazard. . . I'm very lucky that my tire sensor made me look under the Hhr and see gasoline leaking. . . I called gm customer service and they will not except responsibly for rusted fuel lines. . . Its not under warranty. . . I told them that it took 8 years to rust. . . They said that it has 170,000. . . It past its life span. . . It's 8 years old. . . What do I expect. . . I told them that I expect fuel lines to last for ever. . . It's the 21 century. . . Interesting the 2 metal brake lines in the same retainer are in perfect condition. . . They seem to be powder coated, so why not the fuel lines. 2 things that we need, is to stop the vehicle, and no gasoline leaking on the pavement . . . I have pictures of the fuel line.