Hey so I filled up the tank of my stock 2001, 4 cyl, auto wrangler on Friday morning. After driving ~30 miles I was shocked to see that I was 1/4 empty. (or 3/4 full for you optimists) So I was at like 8.25 mpg. I knew this couldn't be right. So I drive about 200 miles and at the end I averaged 17.5 (the gauge slowed down drastically) Not that its an issue but any ideas on whats wrong?