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Toyota Prius MPG-Real World Numbers

767 messages,  Last post on Sep 28, 2009 at 9:21 AM

You are in the Toyota Prius Forum. Your Host is pf_flyer

What is this discussion about? Toyota Prius, Hybrid Cars, Fuel Efficiency (MPG), Sedan


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#629 of 767
Re: Calculated vs Car figures [cdhc] by jana6
Oct 27, 2008 (5:42 pm)
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Replying to: cdhc (Oct 24, 2008 5:11 pm)

Thanks for the hints. I do many of them but not all. I do watch the energy monitor probably way more than I should (!??!!) so I know some of what you are talking about. I'll definitely try more of the suggestions. I do travel on the freeways and go faster than 57 mph just to keep up with traffic so I'll work on that! I knew I needed to keep the tire pressure higher than the suggested but wasn't sure what that was so thanks for that as well. I live in Las Vegas so I wonder if the extreme heat causes problems? I really don't see any difference between winter and summer mpg. I wonder if my computer can be "fixed" at the dealership to at least reflect the actual mileage I am getting rather than always showing 4-5 mpg better than actual, hmmmmmmmmmm. Once my warranty is gone, maybe I can find a hybrid hacker! Okay, maybe I shouldn't say that. But that does tell me that it's my computer that is affecting my gas mileage some. Again, thanks for all the hints.
#630 of 767
Re: Calculated vs Car figures [cdhc] by prius2007
Oct 27, 2008 (6:30 pm)
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Replying to: cdhc (Oct 24, 2008 5:11 pm)

re: "I did a Google search early on after getting the car, and I stumbled on this film clip of a group of a dozen or so people in Japan that are known as ‘hybrid hackers.’ They have hacked into their Prius’ computers, and get over 100 mpg, and in the case of the one lady in their group she gets 150mpg out of a Toyota Prius. I know that hacking into the computer would void my warranty."
 
I read about Japanese hypermilers but not that they achieved >100MPG through as you stated hacking the computer. Perhaps you like to provide the link to this story? Good / great mileage can be achieved without hacking the computer.
#631 of 767
Re: Calculated vs Car figures [jana6] by prius2007
Oct 27, 2008 (6:46 pm)
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Replying to: jana6 (Oct 27, 2008 5:42 pm)

re: "I wonder if my computer can be "fixed" at the dealership to at least reflect the actual mileage I am getting rather than always showing 4-5 mpg better than actual"
 
You always going to have a variance between the MFD MPG as compared to your manual calculation. How do you know that you filled up to the same level as your previous fill? Do the calculation and you'll find just a small variation will have a great sensitivity to the MPG numbers. Added to this complexity is the fact that the Prius has a fuel bladder that expands / contracts over time and its flexibility depends on outside temps. The level of fill-up depends on pump shut-off (some pumps shut off sooner); how fast you fill-up; how level your car is; and temps. Because of all these variables the MFD MPG is more reliable on an individual tank basis. In the long run the MFD has been found ~2% (only) more optimistic than manually calculated MPG over the same extended period.
 
As an example I had my Prius now for 18 months and have driven it for 27K miles with 62 fill-ups. My life-time weighted average MFD MPG is 59.4 compared to 58.3 calculated. On an individual tank basis some tanks have large variations but overall 1.7% difference only.
 
I don't advise to hack the computer instead recommend to study up on the car on www.priuschat.com where you can get lots of great tips from many experienced Prius owners.
 
Good luck,
Gabe
#632 of 767
Re: Be aware of this... [scottc3] by prius2007
Oct 27, 2008 (7:05 pm)
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Replying to: scottc3 (Aug 18, 2008 8:04 am)

...and that's why I don't put much stock into individual tank calculated MPG numbers. However individual tank MFD MPG numbers are very reliable as well as manually calculated numbers over many tanks.
#633 of 767
Re: Calculated vs Car figures [prius2007] by cdhc
Oct 28, 2008 (1:51 pm)
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Replying to: prius2007 (Oct 27, 2008 6:30 pm)

Trying to find it this time around, I'm having trouble finding the same video. This url is along the same lines, and I saw some others on a Google search that appear similar too. http://gas2.org/2008/01/27/hybrid-hacks-and-toyota-yawns/
#634 of 767
Re: Calculated vs Car figures [jana6] by phd86
Oct 28, 2008 (6:44 pm)
Reply

Replying to: jana6 (Oct 24, 2008 3:40 pm)

Jana6:
 
I think you answered the question yourself; what people "claim" in reports on the internet is not necessarily what they actually got. There are various possible reasons for this, such as incomplete refills and reporting only the highest calculated outliers. But the idea that you're doing something "wrong" by getting only 44 mpg; ummm - - - I think you're beating yourself up over nothing.
 
Quite a few people I know drive the prius where I work; we also have some in our fleet that I've tried. They all get low to mid 40's mpg on average. Nobody gets even 50 mpg, and none of them post on edmunds.
 
Hope this helps you feel better.
#635 of 767
Re: Calculated vs Car figures [phd86] by prius2007
Oct 28, 2008 (7:10 pm)
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Replying to: phd86 (Oct 28, 2008 6:44 pm)

What has become routine: http://priuschat.com/forums/fuel-economy/36147-reached-magical-60-mpg.html
 
...followed by many more and higher MPG numbers.
#636 of 767
Re: Calculated vs Car figures [phd86] by prius2007
Oct 29, 2008 (5:28 am)
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Replying to: phd86 (Oct 28, 2008 6:44 pm)

re: "I think you answered the question yourself; what people "claim" in reports on the internet is not necessarily what they actually got. There are various possible reasons for this, such as incomplete refills and reporting only the highest calculated outliers."
 
how is this possible given your stmt?!!!
link title
I finally broke the 100 mpg/tank barrier! On 9/16/08 I filled up with 8.58 gallons after traveling 867.4 miles for 101.096 mpg.
link title
 
  
__________________
 
#637 of 767
Re: Calculated vs Car figures [phd86] by prius2007
Oct 29, 2008 (6:07 am)
Reply

Replying to: phd86 (Oct 28, 2008 6:44 pm)

phd86:
re"Nobody gets even 50 mpg, and none of them post on edmunds."
  
Is that so?!!! Then what is this:
link title
http://www.edmunds.com/toyota/prius/2009/consumerreview.html
 
HMMM phd really does mean "Pile it Higher and Deeper"!!!
#638 of 767
Real Miles by oldcoach
Oct 29, 2008 (7:45 am)
Reply
I have a 2008 prius with pg 2 and have driven just over 5000 miles and my real MPG is 48.6.

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