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I've noticed that occassionally, when going down a very long hill, the consumption screen shows multiple bars (5 min segments) at 100 miles/gallon (as it should), but occassionally a bar in the middle showing 0 miles per gallon - even though I was cruising down the hill all the time without using the throttle. Has anybody else seen this? I'm a little worried that this problem might mean I can't trust the cumulative MPG reading, as it may be being corrupted by the same problem.

Also - again down a long hill - even after the battery has fully recharged - I continue to get the green leaves indicating 50watt hours regenerated, even though no power can be being regenerated as there is nowhere for it to go. Anybody got any thoughts on this?

steve
 

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The power is being regenerated all right. Those green cars (not leaves) are simply showing what the generators are doing. And they're busy generating electricity.

The fact that there's nowhere for the electricity to go except out into the atmosphere as waste heat doesn't change the fact that electricity is being generated.

I'm guessing your display thing is just a visual artifact, and not an indicator of the actual calculations going on.
 

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syoun10 said:
Has anybody else seen this? I'm a little worried that this problem might mean I can't trust the cumulative MPG reading, as it may be being corrupted by the same problem.
It is not a bug, but it's specification for the 2006 and later Prius MFD. :p
The MFD displays zero mpg bar if you did not consume any fuel at all on these models.
The MFD on 2004-2005 Prius shows 99 mpg on such condition.

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I can confirm that on my 2004, if I move any distance, without consuming any gas, I get 99 MPG. If I don't move any distance, even if I don't use any gas (say, 5 minutes stuck in a traffic jam,) then I get 0 MPG.

However, for the 'MPG average' meter, it won't go above 0 until I use some gas. So if I fill up at a gas station, reset my MPG average on the MFD, then drive home solely on electric, the average will still be 0. But the consumption bar graph will show 99.
 
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