Recall vs Loss of MPG?

Jesus Christ!! If the ECU update is what has caused this for you, then I'm not doing mine anytime soon!

In all reality, I don't even know if that recall is all that necessary. Apparently, nothing serious ever happened because of it, and the potential for any damage to the car is rather slim, even if you drive like there's no tomorrow.

I had a 2010 Prius before, and let's just say some people (not me) have driven it with a lead foot. After all that abuse, it still ran like a champ, so obviously even them stomping the gas pedal didn't fry the transistors.

Anyway, I hope your MPGs go back up! Disconnecting the 12v battery sounds like a good place to start, but then again I'm no expert. Good luck!

 

Interesting. There's been a bunch of us here who have had the update, including me. It's a hard call, but I might have seen an MPG drop in the low single digits.. And that's iffy, since the car gets its best when its warm out.

Most others who have reported on the issue have reported a slight loss; others have reported a slight gain; and several have reported a slight change in the driving characteristics. But, to my knowledge, Mr. Goddard here is the first to report such a dramatic change.

Mr. Goddard, if you really are having that big a drop in the MGP, take it back to Toyota. I'm still getting in the low 50's (indicated)/high 40's (calculated); if you've got that big a drop, there's probably something busted.

KBeck

 

There have been more than one member teporting reduced fe. Enough to see a possible trend.

 

It was reported that the software update involves two separate flashes of two different ecu units. Bad outcomes like the OP's resulted when the second flash was started/applied before receiving a message that the first flash was completed successfully.

Take the car back to Toyota. I'm not sure if the ecu units can be reflashed or not, or if it's FUBAR and will need to be replaced.

 

how many tanks have you driven since the recall? i don't think resetting is going to change anything.

 

No issues after the update for me.

 

No issues after the update for me either, for those of you who are thinking about not the update should change you mind because the update in critical to the longengivity of the inverter. I had mind done & also had a Tanabe strut brace & it was hard to get to the fuse box if they need to remove a fuse as part of the upgrade. After the upgrade I put on four new Continental pure contact tires & the milage dropped by 2 miles per gal. that should get better after the tires brake in............... George

 

I lost 5 mpg.

 

No issues for me. Check your tire pressure. They may have dropped your pressures? I run 40 ft. and 38 aft. H

 

I did the update and I have no issues with my MPG after. Maybe it's just a coincidence or something greater...

 

I have a new 2014 with the update already done before sale and I'm averaging 50mpg +

 

I had mine done a few months back and had an increase in mpg. However, I've read that there are multiple versions of software for the same Prius model years. It may result in improvement, decreased mileage or no change depending on what software you had to start with. At least that's my take on what I've read on the forum and the various reports of how it has had different effects for different owners.

 

I agree with this; I have heard this happen before ..... And yes, take your Prius back to the dealer.
Give us an up-date on your Prius, after they re-do their software flashes; or other fixes.

 

Same here. Averaging actual of about 52mpg on 6 or 7 total tanks on my 2014

 

My first tank mpg after the recall wasn't good, but this second tank mpg is looking good.

 

I am on my 2nd tank since the recall. My city mileage has dropped from 45 mpg to 36 mpg. Is this normal? Will it correct itself? This is really disturbing.

 

See my post...mine has also dropped 10-12 mpg.