Did reprogram affect your mileage?

Azor · 03-02-2006, 01:20 PM

Quote:

Originally posted by narf@Mar 2 2006, 12:50 PM
I had the most recent reprogamming done about 4 months ago. After that I took a 2000 mile road trip. I found that for the first 1000 miles, the system did behave diferently and the mileage did go down a bit. (Remember this is in the middle of winter when everybodies mileage goes down because of weather and reformulated gas.

Then at about 1000 miles, everything seemed to ga back to normal. And this week when the weather finally hit the 60s and 70s I had the best mileage ever, with an average of about 56 for mostly highway driving.

[snapback]219131[/snapback]

Wow - 56 for highway is great. Good for you. I fear with my long trip from Maryland to Florida and than back up to Maryland in temps between low 30s and high 70s and still nothing higher than 45 mpg (not to mention a total of 10 thousand miles I've put on the car since the reprogram), I'm convinced the gas mileage had permanently been reduced. I will soon be talking to the dealer about what version of the program I do have and insist on the latest if it is an older version. I would hope the mileage can't get worse with latest program...

V8Cobrakid · 03-02-2006, 01:29 PM

I've noticed.. since.. uh.. two days ago, that the car uses the electric system a lot more during warmup. It also uses the battery a lot more during normal use. It's all a lot different than the previous programing. The car does tend to keep above 40mpg a lot easier. When i cruise it gets in the 50's and 60's pretty easy.. but no 70 or 80mpg periods anymore "yet"... i've only been doing short trips to and from work. about 4 miles. (roughly 5 minutes, if that)

my warmup time is a road about 2.5 miles long. No stop signes with a speed limit of 35mpg. All slightly down hill with a very small rolling set of hills. I think its the perfect warmup spot. I usually get 40mpg on the first bar, if not a little tiny bit higher. So.. warmup i still about the same MPG wise.. but i can go faster than normal and still achieve these numbers.

the system doesn't seem to regenerate as well as it did before. Coasting brings some bars back, but i used to be able to put the battery in a green state at the end of my warmup (2.5mile) stretch of road. hmm.. i'll have to try again today.

I noticed i can "no arrows" pretty easy. I can also do that pulse technique.. or was it the glide technique.. ok.. i need to look up the definitions again (no energy to or from battery)... except in warm up time.. all arrows go from the battery.

so yeah.. it's good.. i guess. A lot more test to be done.

devprius · 03-02-2006, 02:44 PM

I had my reprogramming done back in January of this year. Immediately afterwards I noticed a reduction in gas milleage, just as others have. Now, after about 6 or 7 tanks (and 900 mile roudtrip to SoCal), I've noticed that my milleage has not only gotten back up to what I used to see, but appears to have improved overall. I have not altered my driving habits, nor have I radically changed the way the car is setup (tire pressure, amount of oil filled, etc). Whereas I used to see 42 or 43 on the MFD, I'm now seeing 44 to 47.

KTPhil · 03-02-2006, 02:59 PM

Yes, that's the one. Here is a link to the Toyota document:
http://priuschat.com/forums/files/el002t05.pdf

It is only for 36K miles, but you might appeal and see if corporate will reconsider, especially if the problem manifested itself immediately follwoing your reprogramming. Perhaps they spiked power or some other step that put it over the edge?

Azor · 03-06-2006, 06:25 PM

Quote:

Originally posted by KTPhil@Mar 2 2006, 02:59 PM
Yes, that's the one. Here is a link to the Toyota document:
http://priuschat.com/forums/files/el002t05.pdf

It is only for 36K miles, but you might appeal and see if corporate will reconsider, especially if the problem manifested itself immediately follwoing your reprogramming. Perhaps they spiked power or some other step that put it over the edge?

[snapback]219223[/snapback]

Ok - here is the deal. I just spoke with corporate and it seems there was a campaign about people losing mileage after the reprogram. Unfortunately, because it was a safey issue, I can not get my old program back. (no surprise)

The program version issue had nothing to do with the car program but the scantool that the dealer uses to scan the car. They have the correct version (3.0), thus no damage was done to my car from that.

One thing of interest I learned is that there is a bladder in the prius gas tank and that temperature may affect the actual volume in a full tank. However, since I have calculated mileage the exact same way before and after the reprogram in a wide diversity of temps - that becomes a relative error and would not account for the huge difference in my ranges before and after the reprogram.

It is clear that the gas engine behaves differently and the dealer seems to agree with that conclusion.

As for the display:
I will know for sure tomorrow, but Toyota made it seem like they were paying for the ~$500 display and I would pay for the ~$100 labor. That seems fair especially since most likely this problem wasn't associated with the reprogram (plain bad timing).

I just have to constantly remind myself that I am still getting better gas mileage than other cars...sigh

Thanks for everyone's input!

Tempus · 03-06-2006, 07:13 PM

Quote:

Originally posted by Azor@Mar 6 2006, 06:25 PM
As for the display:
I will know for sure tomorrow, but Toyota made it seem like they were paying for the ~$500 display and I would pay for the ~$100 labor. That seems fair especially since most likely this problem wasn't associated with the reprogram (plain bad timing).
[snapback]221338[/snapback]

That's what seems to be standard for after warrantee MFD failures. Toyota comps the refurbished display, and you pay the install labor.

Of course, it's not that hard an install. I'm just waiting for someone to say "Ok, give me the display, I'll install it myself"

SirGreen · 03-06-2006, 08:27 PM

I just got my 06 Prius on Feb 4th 2006.
How do I know what programing I have,
and if I need to be reprogramed?
also after 1400 miles I am just at 44 MPG
Living in the Richmond Virginia area.

KTPhil · 03-06-2006, 10:12 PM

2006 models do not need reprogramming. It was 2004 and early 2005 models only.

03-02-2006, 01:29 PM	#42
V8Cobrakid Senior Member Join Date: Jun 2004 Location: hell Posts: 2,894 My Car: 2004 Prius Model: N/A Package: #9 Thanks: 9 Thanked 18 Times in 18 Posts Friends: 5	I've noticed.. since.. uh.. two days ago, that the car uses the electric system a lot more during warmup. It also uses the battery a lot more during normal use. It's all a lot different than the previous programing. The car does tend to keep above 40mpg a lot easier. When i cruise it gets in the 50's and 60's pretty easy.. but no 70 or 80mpg periods anymore "yet"... i've only been doing short trips to and from work. about 4 miles. (roughly 5 minutes, if that) my warmup time is a road about 2.5 miles long. No stop signes with a speed limit of 35mpg. All slightly down hill with a very small rolling set of hills. I think its the perfect warmup spot. I usually get 40mpg on the first bar, if not a little tiny bit higher. So.. warmup i still about the same MPG wise.. but i can go faster than normal and still achieve these numbers. the system doesn't seem to regenerate as well as it did before. Coasting brings some bars back, but i used to be able to put the battery in a green state at the end of my warmup (2.5mile) stretch of road. hmm.. i'll have to try again today. I noticed i can "no arrows" pretty easy. I can also do that pulse technique.. or was it the glide technique.. ok.. i need to look up the definitions again (no energy to or from battery)... except in warm up time.. all arrows go from the battery. so yeah.. it's good.. i guess. A lot more test to be done. __________________ Silver 9 as of June 12th '04 (over 123k Miles now) Decals, Mud Flaps, 1200Watt Modified sign wave Inverter, BT Tech Rear Brace, coastaletech 2" receiver hitch, and 215/45/17 tires.

03-02-2006, 02:44 PM	#43
devprius /dev/geek Join Date: Jan 2006 Location: San Francisco Bay Area, CA Posts: 89 My Car: 2005 Prius Model: Package: #6 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I had my reprogramming done back in January of this year. Immediately afterwards I noticed a reduction in gas milleage, just as others have. Now, after about 6 or 7 tanks (and 900 mile roudtrip to SoCal), I've noticed that my milleage has not only gotten back up to what I used to see, but appears to have improved overall. I have not altered my driving habits, nor have I radically changed the way the car is setup (tire pressure, amount of oil filled, etc). Whereas I used to see 42 or 43 on the MFD, I'm now seeing 44 to 47. __________________ David Vangerov / 2005 Seaside Pearl, Package #6

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How does the EV mod affect your mileage?	stomsf	Gen II Prius Fuel Economy	21	09-04-2008 02:19 PM
Headlights affect on fuel mileage?	likesmpg	Gen II Prius Fuel Economy	24	08-25-2007 05:04 PM
What all devices in prius will affect gas mileage?	poodlemaster	Gen II Prius Audio and Electronics	11	01-10-2007 06:41 PM
Ever Wonder how an aero change will affect your mileage?	Tempus	Gen II Prius Modifications	1	06-21-2004 07:23 PM
Do option packages affect mileage?	aarons12	Gen II Prius Fuel Economy	5	06-21-2004 12:03 AM

03-02-2006, 02:59 PM	#44
KTPhil Senior Member Join Date: Jan 2005 Posts: 1,313 My Car: Model: Package: Thanks: 0 Thanked 2 Times in 2 Posts Friends: 0	Yes, that's the one. Here is a link to the Toyota document: http://priuschat.com/forums/files/el002t05.pdf It is only for 36K miles, but you might appeal and see if corporate will reconsider, especially if the problem manifested itself immediately follwoing your reprogramming. Perhaps they spiked power or some other step that put it over the edge?

03-06-2006, 08:27 PM	#47
SirGreen Join Date: Feb 2006 Posts: 75 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I just got my 06 Prius on Feb 4th 2006. How do I know what programing I have, and if I need to be reprogramed? also after 1400 miles I am just at 44 MPG Living in the Richmond Virginia area.

03-06-2006, 10:12 PM	#48
KTPhil Senior Member Join Date: Jan 2005 Posts: 1,313 My Car: Model: Package: Thanks: 0 Thanked 2 Times in 2 Posts Friends: 0	2006 models do not need reprogramming. It was 2004 and early 2005 models only.