Full tank X how many miles to empty displayed?

[birdseye]

On the Gen 4 Prius,

When the tank is full how many miles does the indication usually show that you could supposedly drive to empty ?

 I know it's not accurate but our dealer has asked us to run the tank down to the reserve & refill the tank & reset the trips in order to test a big mpg drop after they serviced it,  the red light came on with it showing 32 miles left & after a refill it shows 575 miles,  is that normal?

 

[GreenJuice]

Seems fairly reasonable to me. Similar to what I see.

[birdseye]

21 minutes ago, GreenJuice said:

Seems fairly reasonable to me. Similar to what I see.

I'm thinking that it only takes into account the distance with the engine actually running so for distance actually travelled including electric mode it will be a fair bit more

[GreenJuice]

I thought it worked it out from a previous mileage recording, perhaps some kind of average, so it would take into account the combination of both petrol and electric usage.

[birdseye]

I'm not sure, the tank only holds 43 Ltr which is around 9.5 imperial gallons,  if I calculated using my displayed 575 miles  from a full tank then divided by 9.5  it would be around 60mpg which is way too low

[PeteB]

I found on my Gen 4 Prius, when I took delivery (dealer gave me a full tank), it estimated about 850 miles, which I knew was wildly optimistic.

After a few fills, it became more realistic, showing some 600 miles in the summer and 500-550 in the winter.  This broadly reflects my own calculations.  It certainly seems to use recent performance, and by my calculations, there's usually 30-40 miles in reserve when it gets to zero, but that assumes the tanks holds what the book says it does and I've filled it to the max (which I try to do to make my tank to tank calculations as representative as possible).

I wish it still had an 11 gallon tank like the original Gen 1 Prius, that would give me a realistic range of well over 700 miles.  As it is, 623 miles is the most I've had between fills, and on that occasion the car thought I had 4 miles left, and my database estimated 43.

My warning light comes on with 35-40 miles left according to the car's display.

I've never risked going below 0 miles on my present Gen 4, but once or twice in the Gen 3 it suddenly went from estimating 10-12 miles left to zero, and a few times I did up to 10 miles with zero showing.

The Gen 1 & 2 Prius didn't have a range estimate display, and I often did up to 50 miles with the warning bar flashing on the fuel gauge, but never actually ran out.

[ian rooke]

Hi if I run my Gen 4 to the warning light coming on I still have 2 gallons left in the tank my Gen 2 and Gen 3 were much the same so by my calculation there is about 120 to 140 miles left in the tank not 30 as indicated