Oxidation/rust of engine parts in 2017 Yaris

[tmontague]

normal, due to the digital nature of the gauge it can appear to read slightly high right after a almost but not full fill up, only to then drop a bar on the gauge shortly after.

What wasn't normal was the pump shutting off before you were actually full. This happens sometimes are various pumps depending on various things especially full fill rate. I have had this happen to me a few times but I know it should take more so I keep filling it and it eventually shuts off when it should.

Just be careful doing this on a new to you car where you're unfamiliar with the tank capacity and its characteristics. if you overfill a tank it can damage the charcoal canister and lead to the premature stopping every time you try and fill the car with fuel.