Why Is There A Penny Welded On My Gas Tank?

Since today's the first full day of Jalopnik's new discussion system, Kinja (a portmanteau of kinky and ninja, I'm guessing) I wanted to treat today's Car Hacks as something of a test. I'd love it if these posts could become their own discussion groups of sorts, as commenters and us writers can talk about ideas, share… » 6/28/12 4:30pm 6/28/12 4:30pm