Attention Prius Owners, I believe I have discovered a previously unknown Mechanism of Low MPG.

Have u tried sweeping or reprogramming the throttle body Just an idea. I know on some cars this can fix a lot of the glitches


iPhone ?

 

Just curious...has anyone tested out if the issue persists after swapping out the traction battery? I'm wondering if the ECU is triggering a different usage profile based on what it determines the health of the battery pack is?

 

I had a friend with a Prius report the low 40s mph and then got the traction battery replaced and said she's back in the 50s now.

Like others have said, I noticed mine dropping immediately when I replaced the 12v battery back in 2017. I'm lucky to get 42mpg on mine and I never use the AC. I've got 274k on original traction battery 2009