2007 getting poor mileage

Do you keep an eye on the battery display on the MFD? Do you get wild fluctuations in state-of-charge? (Shows full one minute and almost depleted very quickly, or the reverse, very low one minute and then very full in too short a time?) May be too early to consider the traction battery. It is a car, and there could regular car problems. Any wheels hotter than the others? (wheel bearing/dragging brakes) burning a lot of oil? Been using cheap gas? (injector/MAF cleaning might be the ticket).
How about the 12v battery? If it is weak, the ICE keeps running (a LOT) to try to charge it.
Best bet, get something that can show details on the battery (TechStream reads every pair of cells and you can compare, looking for weak cells--which is what the dealer should have done.)

 

hard to say without cell testing. dormans are a crapshoot. you can get all new cells from a member here for $1,600. if you want to diy. but your battery may be fine, or a grid charger might help.

i would do an analysis of when the mpg's started declining. new tires? defenders are bad. spark plugs oem?
have you cleaned the throttle body and maf? run some injector cleaner through a few tanks of gas.
air filter? oil level?

 

maybe the prolong charger would be right for you, but a small investment in tech stream to test your battery might be worthwhile.

 

get your best price on a new oem, and compare it to 2k1toasters price for new aftermarket.

i'm not familiar with using tech stream, but there are lots of threads here.

 

If the injectors are dirty one (or more) may be stuck open a little and leaking extra gas into the manifold and running really rich, OR they could be clogged or not giving a good spray pattern and running the ICE lean and giving poor performance. There are a few threads in here where people used Techron gas additive for 3 or 4 tanks and got relief from burning oil and better mileage (I would imagine due to cleaning of the injectors.)

YES! Also listen for noise from the wheel bearings when you do this. (unfortunately, wheel bearings may sound/feel OK when spinning unloaded, and "growl" when spinning with weight on them.) A wheel hotter than the one on the other side of the car could be either brakes or bearings--front to back is not a good check because of the regen on the fronts, check side to side.
Heck, if wheel alignment is bad, it will ruin tires but also cost in mpg! (hit any bad potholes?)
Your description of the state of charge changes does sound suspicious. You might want to ask the service dept if they have the battery report from your service, or just show you that the battery cells were showing balanced and OK.

 

What you will usually get is a pirated copy of Techstream that may (probably) set off antivirus alerts. Most people get a "burner" old Win 7 laptop to install it so they don't take a chance with a good laptop with personal information on it.

 

Another possibility -- my hybrid battery took years to die, but lower mileage was one of the first symptoms. You are only 2 years from my end result of changing the HV battery. My Toyota dealer told me the battery was "in spec" to my complaints when it was still in warranty. I think they only really respond to very obvious master warnings. Good luck:

Bad Hybrid Battery & Mileage Chart | PriusChat

 

$1,950 is their retail on the part, that's what they charged me. Anything more is excessive. $2,300 is a good installed price, mine was $2,700 (parts, labor, & taxes included). BTW, my prices are fresh. Just had it done 3 days ago.

 

Mine did that too before it failed. Living and driving on flat roads, I thought I was the regen king. Guess not.

BTDT it will work fine for this, just use an extension cord. Since I started using techstream so much trying to repair my HV battery, I decided to get a cheap 12v to 120v inverter to run the laptop so I wouldn't have the extension cord PITA.

Their business, their rules.

You will also be charged up front a $1350 core charge that's refunded when you return the old battery. You don't get charged that if the dealer does the install.

 

$1950 is a very good price. best installed price i've seen is $2200. iirc.

 

Take lots of pics! We love a good story!