Poor gas mileage

welcome!
start with tire model and pressures. then check the 12 volt. then move on to the emergency brake and calipers.
what is your speed on the highway? are you up to date on maintenance? is it hot there, a/c blasting?
is the oil full, air filter clean?

 

Welcome to Prius Chat .

How much AC are you using? What type of terrain is the Prius subjected to?

 

the dealer can scan the hybrid battery for voltage parameters under load.

 

The same problem I have but the high temperature I have is up to 100-107 and the AC always on Is that normal I hope help

 

There are many possible issues. We need more clues before suggesting meaningful help. This questionnaire will help give us more clues. About the only common item it misses is brake drag from sticking or frozen calipers.

Fuel economy complaints/queries? Please copy, paste & answer these questions, esp. if you're new | PriusChat

 

It is very difficult to track down what might be causing a significant MPG drop with a Prius over the internet.
All the advice thus far are good starting points.

My suspicion?
Is you say the brakes were replaced.
Going entirely on a guess and instinct, the above mentioned brake drag I think could be something to investigate.
Prius Brakes are a very important and integrated part of the entire HSD system. I would want to make sure they were replaced correctly and that nothing is happening manifesting from them. I'd get them checked out.

 

The primary thing you can do is monitor the # of bars in the battery indicator, called State of Charge, or SOC. In steady, level driving, the SOC should be between 4 and 6 bars. If your SOC spends a lot of time below 4 bars, the internal combustion engine (ICE) will spend extra time and gas re-charging the traction battery.

 

You really need to say what tire pressures you are running. Most will run more than the door jam sticker says, such as 39 front and 37 rear, to get best MPG. Also, the tire brand/model makes a big difference. Prius is quite sensitive to tire model and brand for best economy. Good low rolling resistance (LRR) tires are more expensive than standard tires, but will significantly improve MPG.

 

Again: what speed are you doing, on the highway?

35~38 is very low, something's going on i think. Yeah post what your tires are.

Also, just after you stop, feel all four wheels, see if any are exceptionally hot, might be a dragging brake. Have they ever been serviced? Not sure?

 

He say's they were replaced, which is why this is an area in which I would be suspicious.

 

Rear brakes in particular are my "usual suspects", they are very easy to screw up, with bad results. That in itself is a poor design.

 

My 2016 Prius seems to be out of spec. I also have a 2008 Prius which is giving exactly the same 53.4 MPG/US as the 2016 G4 model. Having driven Prius for a few years I know all the tricks to get best mpg but the 2016 wont play ball. It goes in for its warranty service to Toyota each time I tell them its got grotty fuel economy each time they tell me to change fuel from 91 to 96 octane or higher. That has to be rubbish, as the 2008 runs on 91 octane, and this G4 claims 69MPG/US. Ive suggested that the battery may be leaky or similar but the service people are adamant the octane will fix, even though owners manual states '91 octane or higher, unleaded'.
Anyone else getting same low fuel economy?

 

even 91 is high. doesn't the manual say 87, or is that just u.s.?

are you tracking fuel economy by the tankful?

 

87 is just North America. Different countries have different rating scales.

 

thank you.