Guys, my CEL keeps coming on, every time I get it checked its the same thing. Some kind of Evap leak, very small, small, one time it said massive. We've looked this thing over, replaced the cap once, it went off for about 2 weeks, came back on. Unplugged the battery, went off for 2 weeks, now its back on. Took it to O'Reiley's can got them to clear it for me. Now its back on. My gas mileage sucks, compared to my friends. I'm running about 11 with a 5 inch lift on 31's. She's running 17+ with 2 inches of lift on 31's. I didn't buy it for MPG, duh. But still do I need to worry about this?