Join Date: Nov 2003
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Originally Posted by moocatdog
Thanks for the replies. I've checked all the usual suspects (tire pressure, oil level, etc.) and am aware of the seasonal mileage differences. I don't believe this is related to any of those causes. It appears that my MPG is in a slow decline that started in the summer months and is continuing to drop. I'm entering my third year with the Prius now and this is an unprecedented turn of events. I'm curious to see what the service tech can tell me about this when I take it in later this week.
Hey, Hep, thanks for the welcome! I'd show up around here more often, but demands on my time keep me from participating as much as I once did.
Originally Posted by DanMan32
Here's a possible answer: HV battery charge range declining.
If the battery is starting to get weak, symptoms would include worsening acceleration and MPG.
You probably won't get a DTC for this, as the voltages still fall within range, just not as long as they used to.
If you have an EV mod, see how far you can drive at 34MPH starting at 6 bars before it kicks out of EV and ICE starts.
Maybe we should all do this to get a baseline so we can tell when the HV is starting to go.
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