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I have a 2005 Sienna as my primary car and a 2012 regular Prius for the wife. I am like others in that I try to play the game to maximize the mpg whereas she gets in and goes. Blah!

My commute each day is 20 miles roundtrip which includes a lengthy downhill (city street) going to work and a gentle incline (highway) going home. The route home is 1 mile longer but much more efficient than climbing the hill in the Sienna. When I do get to drive the Prius, I engage the cruise control at the top of the big hill and regen all the way down. The cruise will use adaptive regen to maintain the set speed. Sometimes I set the cruise at 35 at the top, then release the cruise and coast increase speed to 43mpg, then resume cruise. The car will actually regen harder and slow down to return to 35mph. I can do that a couple times based on the length of the hill. Depending on the level of charge when I left the house, usually the battery gets completely full at the bottom.

Does the cruise on the Pachy do that as well? I understand the regen to consume is far from 1 to 1, but does the car have full access to the entire battery to store energy? I thought one of the Plug-in Prius' had what felt like 2 separate batteries. One of them could only be recharged by getting plugged in. I recently drove to the east coast in our Prius and crossed over part of the Appalachian mountains. There were several 7% grade downhill for 5+ miles. I thought the Prius was going to explode as it revved the engine to dissipate the energy it could not store in its already completely full battery. I assume the Pachy would simply love all the regen with its spacious battery. But how much battery is replenished after driving 300 miles?

In the Prius, the car always tries to get the battery to stay around that 80% full mark. Does the Pachy do something similar to try and return to EV when power demand is lower? I realize getting a 16k battery to 80% would take awhile and may be inefficient in the grand scheme. I am asking because I don't know.

Sorry if these questions seem silly. All of the videos that I have seen all talk about what the grill looks like and where to find to electric outlet. I want to see a video demonstrating a typical commute or a major downhill run. I do not own a Pachy and will probably wait for awhile for the real data to paint the real picture about its reliability.

Thanks for your time.
 

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We now own a Plug In Prius (PIP) and the PacHy so I think I can answer most of your questions here. The PIP has one battery and will indeed regen that extra space on a long downhill assuming you have used it up prior to that downhill. I have seen this to a small degree in the PacHy as well, but haven't had a long downhill to really test it fully yet.

In the PIP, the car still likes the "80%" in Hybrid mode, but it just happens to be a much smaller percentage of the total battery. I assume that the PacHy works this same way, but aside from the percentage of battery for the EV only driving, there does not seem to be any visibility on what charge the PacHy likes to stay at during hybrid driving like there is in the PIP. However, there has to be some logic to it in order to ensure the battery is kept within safe levels for the longevity.

Hope that helps and I answered most of your questions. I am happy to help with any others PacHy or PIP related if I can.


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