Lately I've noticed that my gas gauge has been reading lower than it should and then it's where it should be later. First time was last weekend. I only traveled 43 miles since I filled up but the gauge was down one pip. It was to soon for that. Later on it showed full. This morning I noticed it was one or two pips from half full (143 miles). That's a lot of gas for that many miles. And then again, it was where it would be later. Has anyone else experienced this?