Poor Fuel Milage

but they wouldn't be the cause of the decline from 40 to 29, unless they were installed at that time.

 

That's what I think. OP changed plugs, pvc, air filters, tires, and 12v. Nothing with the brakes. If anything, that should increase the overall mpg, not dramatically reduce it from ~40 to ~29 mpg. I keep thinking of a failing traction battery.

 

also changed the tires after the fall in mpg.

 

what did you calculate on your last fill up?

 

All I can have is suspicion.
But I'm suspicious of it being something connected to the Hybrid Battery or the Hybrid Battery itself. With MPG loss at that level, that's where I'm drawn. Plus...

That's a suspicious statement from a seller. Why would someone go to the financial investment of Hybrid Battery replacement and THEN sell vehicle? If you planned to sell it and was at all proud of the replacement, why wouldn't you keep receipts proving the work was done?

There's a lot we don't know.
Primarily...was it REALLY replaced?
If so by who? If so with what? Remanufactured? Refurbished? Salvaged? OEM?
Whole Battery or individual cells?

Not knowing anything about this bit of history could mean nearly everything.

But given how low your MPG actually is, I'm discounting factors like tires, highway driving speed, and PSI. Not that those cannot have impact to some degree but I don't think either separately or in concert, those factors shouldn't put your mileage in the mid to low 20's. My opinion on HSD is it's a amazingly durable system. It covers up for a multitude of drivers sins.

I think you'd have to be using Fred Flintstone "stone" tires to get the mileage you are getting.

It's pure speculation, but I'd be waiting for the inevitable Hybrid Battery Failure code.
My dark and unfortunate bet, is going on HV battery related problem.

I hope I'm wrong.
Be nice if it was as simple as pumping your tires up, driving a little slower on the freeway and/or just replacing your 12 volt battery.
But, given the sellers apparent statement, I can't muster up that optimism.

Again, I hope I'm wrong, and if it makes you feel any better, I easily could be.

 

ouch.

 

Kinda the same here in NC. Heat in the morning, AC in the afternoon, heat at night.
We have 3 or four versions of all 4 seasons!

 

Havent read but a few posts to start since people like to ramble nonsense but I would also look at your HV Battery state of charge. I dont want to worry you about your HV Battery but when that sucker gets corroded or state of charge is not where it needs to be it will hurt your MPG instead of the engine performance area. Take it to a specialty hybrid shop if you have one in the area or possible local dealership might be able to help you out. Reading State of Charge isnt difficult but the end game is what needs to happen to fix it which could be pricier than you could expect.

 

Didn't notice if anyone mentioned cleaning the MAF and throttle plate. Read through it fast so could have missed that mentioned. As some said 40-42psi front, 38-40 rear, 2 psi spread. Keep cruise @ or below 62 MPH if possible, and check ICE operating temp (180*-190*). Also, for the most part, drive the vehicle normally, except try to say away from jack rabbit starts. Try these actions and see if mileage improves. hope this helps Peace. Post results.

 

[QUOTE="I try to stay behind semis too to break the wind lol.

Posted via the PriusChat mobile app.[/QUOTE]
Drafting, Lol! I made a trip your way West of Asheville. From the foothills to the mountains and back (200 miles or so) I averaged 50 mpg all hwy. Not bad since my 07 has 199k. I just got a new hybrid battery cell (#5 I think, idk). I’m getting about 42 city. I know a great place (NC) that works on them cheap, just saying.

 

The only place to get one of those is from Toyota as part of a new battery pack. You can get used modules that may still have life though.
The advice here is to generally either get a Toyota OEM battery pack or use @2k1Toaster's kit of new cells if DIY. The kit replaces all cells for $1600 shipped. The link is in my signature.

 

Whatever, he did it worked. It didn’t cost me that much.