Fuel Gauge

Mine once filled to ten bars, lost a bar, then went back up next time I started my car. I figured it was on the borderline between the two. I wouldn't worry unless it does it more often and shows a bigger difference.

 

Ditto what Paradox said. If you are OCD and watch the gauge too much, you may occasionally catch the gauge going up two bars. The old fashioned analog gauges did this too.

 

My thoughts, same as above. My tank must hold 10 gallons plus. If no one is waiting behind me I always top it off til no more fuel can be added. I put 9 gallons in today and was still on 2 bars. My Ultra Gauge showed 1.4 gallons still in the tank, which is normal every time I fill it. Would not think the filling neck would hold 1/2 gallon plus but it might. Have put 9.6 gallons in with the fuel light blinking. My Ultra Gauge said I had .8 of a gallon left. I rarely run a car this low on fuel but since we bought the C I have a few times just trying to see how far I could go.
Dan

 

Mine does the same thing however it always goes to full after a few kilometers.

 

Mine does this fairly frequently... 9/10 when leave the service station, then 10/10 later, maybe even a day later. I stopped worrying about it.

I never top-off unless I suspect an issue with the automatic shut-off (some are a little too sensitive).

 

Just remember that the Prius uses the same old analog float device in the gas tank as your older cars. It only coverts the analog signal to digital and displays it as bars. So it is going to behave just like your older cars. Except that it was hard to see small movement in the gas gauge needle but easy to see a change in bars.