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Interesting charts. I suspect my prius is showing it's age since I'm having to do somewhat extreme driving to just hit the corrected EPA figures (46mpg combined). Maybe I have a weak module in the battery pack or something causing issues. I don't have a blue tooth adapter for OBD2 since I rarely use my cellphone for stuff like that. I have a OBD2 to usb adapter though if there's a pc/laptop variations of software that can pull the figures for the module health.
There must be something going on, maybe the cat system is getting plugged up, it has been flagging a cat inefficient code so the cat isn't burning off the exhaust gases as well as it's expecting, or the secondary o2 sensor is bad.
I have a 2nd prius that has some title issues I need to get fixed up. Maybe I should swap the hybrid battery from that car just to see if it effects anything. It's a 2009 instead of a 2006 so a little bit less age on the battery, and if I remember right it has less miles too.
I suspect swapping the battery to lithium ion wouldn't work very well with the stock setup since the charging process is a bit different. I know some had lithium ion as an option, not sure if that was newer generations or this one included that too, thinking it's the 2010+ era though. Maybe I can run across a wrecked 2010 prius and swap over some parts to "upgrade" this one.
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