MPG guage updated?

alfon · 11-01-2009, 05:05 PM

Does anyone out there have confirmed information that the newly manufactured Prius's have there MPG guage updated to reflect a more accurate reading.

Our Prius was the first to come off the line back in May 2009, and currently approaching the 14,000 mile mark.

The guage has been consistenly off by 2-3 MPG from the beginining.

I believe some of the newly manufactured Prius's have a more accurate reading than earlier ones.

Can anyone out there with a newly manufactured prius confirm this.

alfon

Yankeefan · 11-01-2009, 09:56 PM

Mine was built in Sept. My gauge was dead on when I did my calculations on a recent 720 mile road trip. I can't confirm nor deny, just saying what I found.

spiderman · 11-02-2009, 01:09 AM

Quote:

Originally Posted by Yankeefan

Mine was built in Sept. My gauge was dead on when I did my calculations on a recent 720 mile road trip. I can't confirm nor deny, just saying what I found.

Very interesting. I wonder if they patched/fixed their software. I will have to ask my dealer when I bring it in for the OCI.

Have you been able to check your speed readout say to a radar gun?

hotbrass · 11-02-2009, 10:50 AM

Mine was made in Aug and it is 2-4 mph off. I checked with ScanGuage and two different GPS systems.

spiderman · 11-02-2009, 11:29 AM

Quote:

Originally Posted by hotbrass

Mine was made in Aug and it is 2-4 mph off.

MPH or MPG? Mine is about 1 MPH off where as the MPG is about 5% or 4 MPG.

ALS · 11-02-2009, 11:49 AM

MPH is off about 1 mph at 55 mph. And the only time I have checked gas mileage against the HSI I was off just a hair at 1.1 mpg. That was at the first click of the nozzle BTW.
Manufactured May of 09.

tumbleweed · 11-02-2009, 12:06 PM

The speedometer is not relevant to the consumption display. The speedometer reading that is displayed is always going to be fast because of the UN regulation on speedometers. The ODB knows the true speed of the car, a ScanGauge will display the actual speed.

The consumption display uses fuel flow to the injectors and distance traveled, not speed. The consumption display is also off but not because of any regulation, it's off because Toyota marketing decided it could fool the customers into thinking the car actually got better mileage than it does. They didn't think some owners were actually smart enough to figure out what they had done fairly quickly.

If it has been fixed on later cars that's very good but it's most likely as close as they will ever come to admitting that they made an error in judgment. I will be pleasantly surprised (very surprised) if they call in the earlier cars and offer to fix the problem.

deltron3030 · 11-02-2009, 12:10 PM

newb question...how do i figure out the manufacture date of my car?

tumbleweed · 11-02-2009, 12:15 PM

Quote:

Originally Posted by deltron3030

newb question...how do i figure out the manufacture date of my car?

There is a sticker inside the driver's door frame.

chiguy · 11-02-2009, 12:48 PM

So what would I ask for if I were to go to the dealer? Firmware updates?

11-01-2009, 05:05 PM	#1
alfon Senior Member Join Date: May 2009 Location: seaside, oregon Posts: 185 My Car: 2010 Prius Model: III Package: Navigation Thanks: 0 Thanked 44 Times in 15 Posts Friends: 0	MPG guage updated? Does anyone out there have confirmed information that the newly manufactured Prius's have there MPG guage updated to reflect a more accurate reading. Our Prius was the first to come off the line back in May 2009, and currently approaching the 14,000 mile mark. The guage has been consistenly off by 2-3 MPG from the beginining. I believe some of the newly manufactured Prius's have a more accurate reading than earlier ones. Can anyone out there with a newly manufactured prius confirm this. alfon

11-01-2009, 09:56 PM	#2
Yankeefan Captain Planet Join Date: Oct 2009 Location: Charleston, SC Posts: 25 My Car: 2010 Prius Model: V Package: Navigation Thanks: 3 Thanked 1 Time in 1 Post Friends: 0	Re: MPG guage updated? Mine was built in Sept. My gauge was dead on when I did my calculations on a recent 720 mile road trip. I can't confirm nor deny, just saying what I found.

11-02-2009, 10:50 AM	#4
hotbrass Senior Member Join Date: Sep 2009 Location: Cowtown Posts: 219 My Car: 2010 Prius Model: IV Package: Base Thanks: 22 Thanked 16 Times in 13 Posts Friends: 0	Re: MPG guage updated? Mine was made in Aug and it is 2-4 mph off. I checked with ScanGuage and two different GPS systems.

11-02-2009, 11:49 AM	#6
ALS Senior Member Join Date: Jul 2009 Location: Pittsburgh Posts: 218 My Car: 2010 Prius Model: III Package: No Package Thanks: 6 Thanked 25 Times in 21 Posts Friends: 0	Re: MPG guage updated? MPH is off about 1 mph at 55 mph. And the only time I have checked gas mileage against the HSI I was off just a hair at 1.1 mpg. That was at the first click of the nozzle BTW. Manufactured May of 09.

11-02-2009, 12:06 PM	#7
tumbleweed Senior Member Join Date: Oct 2005 Location: Eastern Oregon Posts: 1,692 My Car: 2010 Prius Model: V Package: Adv. Technology Thanks: 33 Thanked 104 Times in 84 Posts Friends: 0	Re: MPG guage updated? The speedometer is not relevant to the consumption display. The speedometer reading that is displayed is always going to be fast because of the UN regulation on speedometers. The ODB knows the true speed of the car, a ScanGauge will display the actual speed. The consumption display uses fuel flow to the injectors and distance traveled, not speed. The consumption display is also off but not because of any regulation, it's off because Toyota marketing decided it could fool the customers into thinking the car actually got better mileage than it does. They didn't think some owners were actually smart enough to figure out what they had done fairly quickly. If it has been fixed on later cars that's very good but it's most likely as close as they will ever come to admitting that they made an error in judgment. I will be pleasantly surprised (very surprised) if they call in the earlier cars and offer to fix the problem. __________________ Tom

11-02-2009, 12:10 PM	#8
deltron3030 Member Join Date: Sep 2009 Location: Lakewood, CA Posts: 73 My Car: 2010 Prius Model: II Package: Base Thanks: 0 Thanked 11 Times in 7 Posts Friends: 0	Re: MPG guage updated? newb question...how do i figure out the manufacture date of my car?

11-02-2009, 12:48 PM	#10
chiguy Junior Member Join Date: Jul 2009 Location: Champaign/Urbana Posts: 12 My Car: 2010 Prius Model: II Package: Base Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: MPG guage updated? So what would I ask for if I were to go to the dealer? Firmware updates?

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