MPG Display question

[whodat]

I'm attaching a photo of the MPG histogram display where the yellow bars are not present for a 5 minute duration and there are 2.5 green cars present. The conditions for the 5 minute duration are going downhill where I've been charging the battery and using little or no gas.

I see this almost daily during my commute and am just curious as to why the yellow histogram bar for this 5 minute duration is not present.

Thanks
Dave

[Freedom]

I 'think' you answered your own question.

This screen is showing Consumption: GASOLINE consumption, not electric battery consumption. "The conditions for the 5 minute duration are going downhill where I've been charging the battery and using little or no gas."

[TonyPSchaefer]

I think that's the 100+mpg indication.
Check out this thread: Explain this for me particularly Ken's post #10.
And this one: http://priuschat.com/forums/prius-ma...ongestion.html look at Icabod's post #8.
And Darrel's post here: Most Obscure Prius Facts (Way out there)

It would seem that the 2004/05 shows a full bar while the 2006/07/08 shows a blank. I think that's rather odd but that's what it's sounding like.

[McShemp]

Originally Posted by TonyPSchaefer

It would seem that the 2004/05 shows a full bar while the 2006/07/08 shows a blank. I think that's rather odd but that's what it's sounding like.

That's how you gen Prius displays when you burn zero gas in a five-minute segment.

FWIW - I'd rather see 99.9 myself.

[qbee42]

It's a divide by zero issue. In most parts of the world, mileage is expressed as fuel burned per standard distance. In the U.S., we use distance covered per standard fuel volume. Either way it's a fraction, and you have a problem if the denominator is zero. Anything divided by zero is undefined - in this case it would be infinite. Lacking any way to conveniently display infinity, Toyota elected to use a blank bar.

Tom

[dwreed3rd]

The fact that anything except zero divided by zero is infinity probably dosen't help the developer/programmer trying to deside what value to assign to mpg when gallons equals zero for any period of time.

[dwreed3rd]

Originally Posted by qbee42

It's a divide by zero issue. In most parts of the world, mileage is expressed as fuel burned per standard distance. In the U.S., we use distance covered per standard fuel volume. Either way it's a fraction, and you have a problem if the denominator is zero. Anything divided by zero is undefined - in this case it would be infinite. Lacking any way to conveniently display infinity, Toyota elected to use a blank bar.

Tom

Sorry! didn't see your post. You must have beat me to the "Submit Reply" button.

[qbee42]

Originally Posted by dwreed3rd

Sorry! did see your post. You must have beat me to the "Submit Reply" button.

Not a problem. I do that all of the time. Usually Tony beats me to the post.

Your answer was better anyway. It said the same thing in less words, with more clarity.

Tom

[dwreed3rd]

Thanks! Yours mentioned the blank bar though and I didn't know that. We're still on the wait list.

[whodat]

Originally Posted by qbee42

It's a divide by zero issue. In most parts of the world, mileage is expressed as fuel burned per standard distance. In the U.S., we use distance covered per standard fuel volume. Either way it's a fraction, and you have a problem if the denominator is zero. Anything divided by zero is undefined - in this case it would be infinite. Lacking any way to conveniently display infinity, Toyota elected to use a blank bar.

Tom

Thanks for all that posted on this thread. I wanted to add a few facts. I believe I was still consuming some gas (although small) since my velocity was greater than 41 mph. Above 41mph the thermal combustion engine automatically turns on, so I am consuming gas during this 5 minute interval with the thermal combustion engine idling.

Because of this, I don't believe the calcuation is dividing by zero. Perhaps a small number, but not zero.

Thanks
Dave