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Toyota Prius MPG-Real World Numbers

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

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


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#548 of 767
Re: MPG question and Consumption Screen [rolin] by v7sport73
Apr 27, 2008 (4:22 am)
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Replying to: rolin (Apr 27, 2008 3:48 am)

I wish they had more detailed information on how the screen works as far as tracking milage. For one thing why does it stop at 99.9 MPH? I know that the meter is samping MPH all the time and storing and adveraging the information on MPH but how many samples does it use? Anyway I love my new Toyota! I haven't got the air kick thing down yet but I'm working on it.
#549 of 767
Re: MPG question and Consumption Screen [rolin] by katerhiner
May 02, 2008 (6:56 am)
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Replying to: rolin (Apr 27, 2008 3:48 am)

Hi Rolin - I just purchased an '08 Prius w/ the #2 package, and had many of the same questions you have about fuel consumption. I think I'm starting to figure it out. First, I was told that I would get about 600 miles to a tank of gas. NOT true! Ha. I get about 450 miles/tank. The computer tells me that I'm getting an average of around 45 - 46 mpg, but both times I've refueled, I've done the math myself (I reset Trip A odometer each time I refuel, so the next time I know how far I've gone), and I'm really only getting about 43.5 mpg. Not sure why. I know the tricks like accelerating as quickly as possible to the speed you're going to go, then staying there to maximize mpg, and coasting a lot, and all that. Don't know if the mileage will get better over time, or what. But it's not quite as good as I'd expected.
 
The way to calculate your real mpg is to set the odometer to 0 when you refuel. Then, next time you go get more gas, divide the # of miles you've driven - say, 423.9 miles - by the # of gallons you've just purchased - say, 9.8 gallons. That would be 423.9 / 9.8 = 43.25 mpg.
 
As for consumption vs. the other screen (can't remember what it's called right now) - one screen shows you what you're getting at any particular moment, and yeah, it'll go way down when you're accelerating hard or going up a hill. The other screen shows you your average over the past x miles (you have to reset it yourself, and it'll tell you how many miles you've gone since the reset).
 
Hope that helps.
#550 of 767
FE Report by cheryl06prius
May 02, 2008 (7:56 am)
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For what it is worth my FE stats for the first 3 months of 2008, with my '06 Prius, is 50.8MPG over 5227 miles. This is in Western NY and reflects the windy and cold winter conditions, 75% level, about 50/50 city/highway split.
 
My advice to Prius drivers attempting to calculate FE: develop a system of filling the tank to the same exact level, and not relying on the elapsed FE gauge. This takes great patience and it is very slow, don't attempt it when the gas pump line is busy. If you live in NJ where there is no self-service, you're out of luck.
 
My elapsed gauge fluctuates a great deal. One fill up it will show 57MPG and manually it calculates to 50MPG, the next fill up it will be 50MPG both ways. It will take many fill ups to establish an accurate FE figure. Don't rely on two or three fill ups.
 
That said it is still a great car and I plan to purchase an '09. I just wish the bladder factor didn't make it so difficult filling the tank.
#551 of 767
Re: FE Report [cheryl06prius] by johndjr
May 02, 2008 (5:52 pm)
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Replying to: cheryl06prius (May 02, 2008 7:56 am)

I agree with you. I attempt to fill mine up to the inner ring each time so I know that it is full. Only thing, near the full level, the gas tank actually honks at me, then shortly afterwards, it burps up about a cup full of gas all over the side of the car. It looks as if there is a slight eruption in the tank.
The difference I have between the computer mpg and my calculated mpg is that the cal. comes out about 10% less than the computer has. Still, 46-48 mpg cal. isn't bad.
#552 of 767
Re: FE Report [johndjr] by cheryl06prius
May 03, 2008 (6:53 am)
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Replying to: johndjr (May 02, 2008 5:52 pm)

I hear a distinctive gurgling sound as the tank gets full, guess you could characterize it as "honking". Sometimes I'll leave the nozzle in the tank for 60 seconds or more to allow the gas time to recede and not spill out. Still i've spilled my share of gas, it does take time and patience filling the tank.
#553 of 767
Re: FE Report [johndjr] by carbot
May 03, 2008 (9:46 am)
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Replying to: johndjr (May 02, 2008 5:52 pm)

Why is it so important to know your mileage for each tankful? Just fill until the pump stops each time. Figure the mileage based on that. Then every 5, 10 or 100 fill-ups average the actual mileage and the gage mileage. That will give you a more accurate overall true mileage, gage mileage and difference figure. It will also save you money in spilled gas, and save the environment some spilled gas/emissions. Even given the difference in the stopping point in pumps, it will all average out in the end. My Prius is my office. I don't have time to wait for the tank to "burp"'. At 195,000 miles and over 420 fill-ups, can you imagine the time and spills I have saved?
#554 of 767
Re: FE Report [carbot] by cheryl06prius
May 04, 2008 (4:45 am)
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Replying to: carbot (May 03, 2008 9:46 am)

One reason for continuing to pump after the automatic shut off is that you can ordinarily pump another l to l.5 gallons. In a pinch that is another 50-75 miles you can drive w/o refueling.
I'm not concerned about the mileage for each tankful because I realize the bladder issue distorts the calculation. My main concern is knowing the same exact level for each fill up so that after l0,20 or more you can make an accurate calculation.
 
I'd rather take another 2-3 minutes flling the tank and having the extended driving range in addition to the "exact level" constant.
#555 of 767
Re: FE Report [cheryl06prius] by coupedncal
May 04, 2008 (12:24 pm)
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Replying to: cheryl06prius (May 04, 2008 4:45 am)

I am not sure what reasons you had to buy your Prius, but if it was to help the environment, please consider this action is taking significant savings away from your motivation. There is a reason there is a shut off mechanism in place.
 
Of course, no offense is intended and none should be taken. This is just an advice.
#556 of 767
Re: MPG question and Consumption Screen [rolin] by mlaurenc
May 04, 2008 (3:33 pm)
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Replying to: rolin (Apr 27, 2008 3:48 am)

Give your new car some time to "break in" - they require 6 months at least.
 
Lately (over last 1500 KM ) my 2006 Prius has achieved 54.5 mpg with once weekly driving between collingwood and niagara (140 miles)
 
Breakdown:
60% country roads (50 mi/hr) 40% 6 lane highways (60 mi/hr)
 
Also suggest you might want to look at the folllowing guide to how to drive a Prius:
 
http://www.hybridcars.com/gas-saving-tips/maximizing-mileage-toyota-prius.html
 
Also, I've learned that if the tank is totally filled (careful as it can shoot out if you don't stop as soon as you begin to hear the "gurgling") I get 120 miles before the first indicator bar disappears.
 
Mike
#557 of 767
Re: MPG question and Consumption Screen [mlaurenc] by rolin
May 04, 2008 (4:41 pm)
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Replying to: mlaurenc (May 04, 2008 3:33 pm)

Many thanks! I am starting to "relax" about this..
 
Linda

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