2015 Prius on replacement battery not getting good mpg

2nd replacement? So you got a used battery? Never worth it.
You need the Sodium Ion NEW battery pack.

Never heard of that brand of tire. Tires are important to fuel mileage.
What tire pressures are you running?

Both will highly effect mpg. Cooler weather effect mpg also.

 

Are these battery replacements OEM? Were they replaced by the dealership? Post some results from Dr. Prius app or Hybrid Assistant.

 

Just to clarify: you replaced the hybrid battery, or 12 volt battery?

Off-topic, but if you haven’t: I would clean the EGR (Exhaust Gas Recirculation) system as soon as possible, and replace engine water pump and thermostat.

 

So, what do the tires have to do with it?
You did something, battery, tires, both at the same time? Correlation to cause and effect?
This is actual mpg, miles/gals, full tank?

 

Are these Toyota guess-o-meter numbers or manually calculated tank to tank averages.

It's been pretty cold and rainy in Redding and we know how weather affects these cars. Unless you do an apple to apples comparison, under the same circumstances by adjusting only ONE variable - it's difficult to make general comparisons.

 

I thought I just said that.

 

I was typing when you hit the return key to post your response..... so I didn't see it.

 

I thought you had me on ignore, or something.