Recorded the 1st fill up for my car and wifes car. The stats for Red gas sipper are not correct. It shows 36.1 mpg if you look it up under "browse vehicles." But if you click on the data it actually shows the correct mpg of 38.9.
I had accidentally entered my wife's data under my car, then deleted it.
We cache some data on the site so sections like "Browse Vehicles" can be faster to load than they would be otherwise. Sometimes this leads to lag, especially if you're adding/removing fuel-ups. But the cache is always updated on fuel-up, so things would have sorted themselves out then.
I just manually reset your average MPG on your vehicles, so you should be set. Thanks for letting us know about this.