Graybullet, My issue was the gas cap. It took a lot of toying around, but we discovered that despite my twisting the hell out of the cap to tighten it the damn thing would just pop right off. On the other hand, the technician would tighten it simply and it would seal and stay on properly. It was all a matter of luck. I think the cap has two sets of threads so it could start to engage either at 0 degrees or 180 degrees. One way was just fine. One way was bad. That may not be it exactly but I proved to the dealership's satisfaction that there was a flakey issue with the cap that prevented it from sealing properly every time. They replaced the cap and it has never been an issue since then. Insist on a new cap and I bet your issue goes away.
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