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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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#560 of 767
Re: MPG question and Consumption Screen [katerhiner] by kdhspyder
May 04, 2008 (10:19 pm)
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Replying to: katerhiner (May 02, 2008 6:56 am)

If you want a longterm record of your particular Fuel Economy save the receipts and mark the gallons pumped and miles driven since the last fillup. Then enter them in the GreenHybrid.com database. There are nearly 1600 Prius owners tracking their vehicles.
 
Don't worry about the FE. In the end it will be 48 mpg...with one caveat. If you only use the vehicle for short trips of 15 min or less then you will lose about 10% from the 'norm'. This is true for all vehicles on the road. It's just more obvious in a Prius.
#561 of 767
Re: FE Report [johndjr] by prius2007
May 05, 2008 (8:54 am)
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Replying to: johndjr (May 02, 2008 5:52 pm)

Just completed one year of ownership of my 2007 Prius and I'm very happy with it. I log each tank data/performance in a spreadsheet and my first year MPG = 56.8 (US gallons). Since the 5000 mile break-in period MPG = 58.6. Had several 60+ tanks highest being 64.1 and so far this spring all my tanks are 60+. It is getting better and better - easily exceeding EPA numbers. More than 50% of my drive is on the HWY.
#562 of 767
Re: Fuel Economy issues. [kdhspyder] by cheryl06prius
May 05, 2008 (10:05 am)
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Replying to: kdhspyder (May 04, 2008 10:09 pm)

Some Prius owners are just obssessive-compulsive when it comes to stats.
 
Obviously you are very knowledgeable on Prius issues. Just two questions:
a) assuming no gas spills, what are the adverse results of "topping" the tank, that is the extra 1-1.5 gallons after the shutoff engages?
b)is the trip fuel gauge for the Prius inherently flawed, or are the discrepancies due to bladder issues, i.e. an elapsed reading of 57MPG,manual calculation of 50MPG?
#563 of 767
Re: Fuel Economy issues. [cheryl06prius] by rolin
May 05, 2008 (10:28 am)
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Replying to: cheryl06prius (May 05, 2008 10:05 am)

Great questions. I await responses as well.
 
Thanks
#564 of 767
Re: Fuel Economy issues. [cheryl06prius] by prius2007
May 05, 2008 (10:46 am)
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Replying to: cheryl06prius (May 05, 2008 10:05 am)

Hi Cheryl,
 
Keeping stats is not "obssessive-compulsive" it helps in learning and forming an opinion. Personally for me it only takes less than a minute to log it every two weeks. Being educated about the car helps to give answers to questions like the ones you posted.
a) other than the problem with gas spills you may also damage the charcoal filter and bladder by overfilling the prius. This can be an expensive replacement in case it happens (do a search on the subject at www.priuschat.com). If you for whatever reason overfill drive the car some distance to use up the overfill rather than parking it. An extended period of the overfill condition will increase the chance of the damage to your charcoal filter system etc.
b) Most people call the Prius gas gauge as "guess gauge". Most gas gauges tend to be not very accurate and serve as a guide only. With the Prius the added complexity is the bladder as you pointed it out. It expands/contract with age and fluctuations in temperature. These factors result in the difference between MPG calculated and displayed on the MFD. Tank to tank variations can be significant but long term they should be pretty close. Also some pumps shut-off earlier than others and the rate of speed you're filling up also effects how much you're able to put in the tank.
 
Hope this helps and enjoy your Prius. Just drive it!
Gabe
#565 of 767
Re: Fuel Economy issues. [prius2007] by cheryl06prius
May 05, 2008 (2:39 pm)
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Replying to: prius2007 (May 05, 2008 10:46 am)

Thanks for your explanation. It certainly makes sense. Fortunately I seldom gas up closer than 15 miles from home, so this has probably given some protection in the past. I'll probably reassess my habit of topping the tank. I'm just guessing, but could a damaged charcoal filter/bladder cause the car to failure the state auto emissions inspection?
#566 of 767
Re: Fuel Economy issues. [cheryl06prius] by prius2007
May 05, 2008 (6:13 pm)
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Replying to: cheryl06prius (May 05, 2008 2:39 pm)

I don't think so. The charcoal filter is unique to the Prius preventing the release of fumes when you fill up. Google "Prius emission test false results" - I seem to recall some reports on Google of this in the Atlanta region.
#567 of 767
Re: Fuel Economy issues. [prius2007] by prius2007
May 05, 2008 (6:26 pm)
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Replying to: prius2007 (May 05, 2008 6:13 pm)

http://www.google.ca/search?hl=en&q=prius+emission+test+false+results&meta=
 
Digg - Toyota Prius can't pass Georgia's emissions testautoblog.com — Every Toyota Prius tested has failed the state of Georgia's emissions test because the vehicle is required to idle its engine during the test ...
digg.com/hardware/Toyota_Prius_can_t_pass_Georgia_s_emissions_test - 79k - Cached - Similar pages
#568 of 767
severe driving conditions by pano1
May 17, 2008 (1:06 pm)
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I live in WV, in mountainous terrain, in a city of 20,000 people with lots of congestion and stop and go conditions. I can't go more that 2-3 blocks with sustained speed at any time or any place. Mileage with my other vehicles no matter the size or the brand has historically been around 15 mpg over a tankful. 90% of my driving is in the city and I'm pointing my question to those of you that might have similar or at least, sort of similar, conditions in your town or area. What is the worst expected mileage that you could surmise for my conditions? Would I get at least 30 mpg??
#569 of 767
Prius mileage in actual driving conditions by kalyan34
Jul 03, 2008 (7:17 pm)
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I am considering a Prius but I have been hearing and seeing reports that the mileage is around 35 - 40 MPG under actual conditions which in my opinion can be matched by a regular honda civic. Can someone who owns a prius share some information on the actual mileage of the car in real time driving conditions.
 
Thanks.

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