MPG Slipping - Is It The Battery?

djlen · Mar 30, 2017

jdonalds said: ↑

Our 2008 Prius with about 135K miles (if I remember right) dropped into the mid 30's mpgs. I immediately suspected the traction battery, bought an OBDII Bluetooth adapter and ran a bunch of tests showing the battery was fine.

One day, after two or three tanks of gas while only getting 36-38 mpg, I dumped about 1/2 a can of SeaFoam into the gas tank and the mileage jumped back to the above 45 mpg range. Give it a try. Can't hurt. It must have been dirty injectors. It took me a while to realize it was the ICE, not the EV part that was killing the mileage.

We sold the car with 163K miles, zero problems with the car. We never even had to replace the brakes. The person driving it now has put on another 5K miles so far with zero issues. We bought a new 2015 but the mpgs are still in the 48 mpg range most of the time. It was a little disappointing because I could hit 48 mpg in the 2008 even with all those miles and years on it.

As for me I'm keeping an eye on the Kia Niro to see if it holds up to the promises. I like the interior of the Niro much more than the 2016+ Prius. Toyota is doing things to push me away.
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djlen · Mar 30, 2017

Thanks for the reply. Kind of a moot (thanks Mendel) issue at this time though. I just bought a 2016 and am
hoping this one will not start to fall from an mpg perspective. We'll see........

MPG Slipping - Is It The Battery?

djlen Junior Member

djlen Junior Member

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MPG Slipping - Is It The Battery?

djlen Junior Member

djlen Junior Member