This morning after work I filled my tank. This was just prior to me taking it in for my annual inspection. When I filled the tank, I topped it off, and the gas gauge was literally above the full line. So I took my car into the shop right after this and left it there, then I came home to sleep. I didn't pick the car up until later on in the day, after waking up later in the afternoon. When I was driving home, I noticed that a considerable amount of gas was missing from my tank according to my gas gauge, which I found to be strange, considering I had only driven it a few miles after filling my tank, just before dropping it off at the garage. The gauge was between the full mark and the first notch below the full mark. So it wasn't a lot of gas, but it was a lot considering that I hadn't driven the vehicle other than from the gas station to the place where I got it inspected. So all I can assume at this point is that someone was driving my car around for their own leisure, or someone at the garage siphoned gas from my tank. Or, for whatever reason, they let my car run for a prolonged period of time during the inspection. I am not going to worry about it, but I find this to be rather odd, and it's making me reconsider taking it to this place again to get my car serviced. Unfortunately, I didn't look at my trip odometer before dropping the car off, so I cannot say with certainty that it was being driven around, but so far that is really the only logical explanation. Any ideas from you guys?