More fuel than tank capacity

Is the pump MPG calculation similar to the car's displayed MPG?
Is there any chance to measurement fraud at the pump?

 

I think it may be time to report pump operator(s) to state commissioner.

 

maybe the car is set for US gallons not Imperial gallons..

 

You pumped 48 liters into the tank with two bars remaining?

If the automatic shutoff has a different setting or pumping further into the neck could account for some of it.

Average this tank and the next to see if they offset. You should have a very low number on this one and a very high one on the next. If together they are average then I'd chalk it up to "fuelling error". If the combined average is abnormal I would suspect the pump.

 

You usually get 2-3mi less than indicated on Fuelly. Any chance car was tilted to pass side and/or nose pointed down? That makes the difference. It is also possible that your fuel meter is off, so what you think is 2 bar is actually less.

 

top it off go 200 miles top it off again at the same pump and time of day and see if the mount of fuel used is close, if it is your fine..
I fill my gen 2 and get 140 to 160 miles before it goes below full, full to half is 40 to 50 miles, 300 miles shows 1 bar but the on board computer says im getting 44 to 47 mpg so I should be well over 400 miles before empty..I just top off every 300 to be safe

 

I think there's a clue in the discrepancy between displayed and calculated litres per 100 kms. If for example my displayed is 4.6 calculated is almost invariably 4.9.

Another possibility: are you really running it low, then filling to the neck? That's a game with no winners, and the possibility of spillage.

 

Another trick: when you fill tank put handle at 90deg at 3 o'clock. That allows more consistent fill and no need for topping off.

 

The fuel gauge bars represent a range of capacity. So 2 bars (pips) can mean anything from 1.5-3 gal remaining. Not reliable by any means for predicting MPG or even how much gas it should take.

 

It is very strange: 2 pips left and you can fill more than specd capacity. I believe too it's very difficult if not impossible to siphon from modem cars.

 

People have put more fuel in than the tank's rated capacity on other Prii, but it takes several things: run the fuel gauge down well into the last (flashing) pip; fill the tank into the filler neck, above the normal automatic cut-off point; and possibly have the car tilted significantly while filling. Absent at least two of those factors, you shouldn't be getting that much fuel in.