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Hybrid Gas Mileage Good? Bad? As Expected?
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Comments
11/21/2005 02:26 PM
To: larsb
cc:
Subject: RE: Toyota Prius MPG test verified by EPA ???
Dear Mr. Singleton:
EPA has tested the Toyota Prius.
So yes, they verified Toyota's claims....
So you say there is evidence to back up the CR report that thousands of Prius owners gave a 94% approval rating. CR only uses subscribers for their ratings. That rating came out when only a handful of the Prius II model were sold. I have to call EEEEgh!! I say it is about as worthwhile as the 109 MPG Prius record.
That is not close to any record that I know of. Here is an official 155 MPG record on Guineas. This was set driving 55 MPH from SF to LA.
http://www.canosoarus.com/03CalifCommuter/CalCom01.htm
You did specify the Prius II? I have also sent the EPA an email requesting the test data from those tests. I will share it when it comes in.
That's also FORMER SUBSCRIBERS - I got a ballot the year after my subscription ended.
OK we'll look at it again when we have three years of Prius Data and see if the 94% drops.....
Will it be anymore credible next year than this year? I wonder why CR does not give the number of surveys used to come up with a statistic. Could it be that there are not many suckers left buying the magazine. Does it even amount to 2% of the population. I give it even less credence than political polls.
Prius is a Dog because CR subscribers like it....
It is very possible that more Prius owners show up on the different forums than do on CR surveys. No way to know for sure unless you have some documentation to the contrary.
Hey, it is right there on their web site. The 2004 Prius satifaction rating is based upon 1,640 respondents. Not a lot, I grant you, but they don't hide anything. And they don't make anything up. Maybe you could learn something from that.
Let's try to focus on gas mileage in this topic. Thanks!
kirstie_h
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My cruise control is certainly not hypermiling, and the car well exceeds what I had expected of it.
While we don't have a list solely with the purpose of identifying vehicles that have had EPA Confirmatory Tests performed on them, it
could be derived from our database. Actually, the emission test results data (http://www.epa.gov/otaq/crttst.htm) and the fuel economy test results data (http://www.epa.gov/otaq/tcldata.htm) that's posted on the Internet includes EPA tests... there's just no way for you to identify
them specifically.
Hope that answers your question,
Karen Danzeisen
U.S. EPA
Computer Specialist
So there's the proof.......Using your brain....... :surprise:
You are smarter than that Gary; don't denigrate yourself by thinking something so laughable....
PS
Oh yes, I forgot to tell you - Kia is coming out with a 4 banger and is going to rate it 70/60. EPA would never check anyway, right, so why worry?
http://www.calstart.org/info/OP_ED/In_Defence_of_Hybrids.php
http://www.epa.gov/otaq/cert/factshts/fefact01.pdf
I think the issue is whether or not the EPA has actually independantly confirmed the test results from Toyota or not.
"Honda says in a side-by-side, 2,500-mile drive their engineers made from Ohio to Los Angeles to Colorado, a Civic Hybrid got 43.6 mpg, while the Prius got 42.5 mpg. That's not bad for a route with a lot of severe elevation and weather changes. It was not just all highway driving, either. It was combined mileage.
Because city driving is supposed to be Prius' strength (it's EPA rated at 60 city/51 highway), Honda also did a city-only driving test in Los Angeles. The Civic got 47 mpg, and the Prius got 46 mpg. In an L.A. highway-only test, Honda's Civic got 49 mpg and the Prius got 47.
Honda's point is this: The automaker is closer to getting the mileage it says it will get on the Monroney sticker than the Prius (or any other Toyota/Lexus hybrid product).
Honda's findings were that the Prius only gets 77 percent of the mpg it is supposed to, compared with more than 90 percent accuracy for the Civic hybrid. "
PS
This is not a Prius Bash by any stretch - just interesting to report, since the Prius has been the leader up to now...
I think that's the issue too, and I think anyone who thinks the EPA saw that 60/51 number and just said, "OK, Toyota, thanks for the MPG results !" is in La-La-Land.....:D
Best Regards,
Shipo
Well, if the government (EPA) always acted logically, I would agree with you. If I had the budget to only verify the manufacturers results for 10-15% of the cars, then I would certainly chose those results which 'stood out' the most.
ON THE OTHER HAND (and here's where I put my conspiracy theory hat on... :P), if the government was particularly INTERESTED in pushing hybrid technology, then they might take Toyota's (and Honda's, etc.) results at face value.
nudge nudge wink wink
I've no idea just HOW the EPA decides which cars to verify. I don't know if it is in response to large numbers of consumer complaints about the accuracy of the numbers for a particular model or if the test subjects are chosen by # of units sold or if it completely at random.
I have a letter from a person at the EPA that tells me that there is no way to know if the Prius was one of the 10-15% of the vehicles actually tested. If memory serves me correctly that 60/51 MPG figure came out on the EPA web site prior to the Prius II hitting our shores. All tests by independent and not so independent sources refutes the city mileage of the Prius by a BIG margin. What is so difficult in believing that a bureaucracy like the EPA would let a given car slip past them? The odds say the Prius was never tested by the EPA. If your EPA contact has a name and confirms otherwise I would accept that.
http://www.enerjazz.com/prius/index_gas.htm
Gotta love that!!!
It was much less of an issue in the past. What we find is a race to get the highest mileage cars to market. For the sake of argument, suppose that Toyota assumed in their testing that the Prius would get better city mileage and the results came out that way. Honda wanting to be totally above board put out the actual tests results as specified by the EPA. I realize that the HCH and Prius are not cross shopped very often. However that 13 MPG difference would be a selling point for Toyota. In real world driving the Prius and HCH are nearly identical. Because of the highly flawed EPA mileage on the Prius it gets better treatment for the new tax incentives. It will also have better appeal to those that are strictly interested in gas mileage. I understand the frustration that Honda has expressed.
We cannot rely on the EPA figures. That is what the discussion is about. Each automaker has a lab that they test for mileage in accordance with EPA rules. The results are sent in and the EPA randomly picks cars to confirm those results. It is not rocket science. And not very realistic as the results are confirming.
If they stick cars on a dynomometer and run them for an hour and come up with a number, that's valid for comparison purposes for deciding between vehicles.
Even if it's a flawed test (in terms of returning real world mileages) that doens't make it invalid for telling me that Car A is going to get better mileage than Car B.
Your mileage may vary
Ummm, I have to respectfully disagree. If the EPA estimates for all cars was off by a similar percentage, then you'd have a point, however, there are cars that will NEVER meet their EPA estimates unless rolling downhill with a tail wind. There are other cars that under certain neutral and carefully driven circumstances can actually achieve the EPA estimates, while others can easily beat those same estimates. An evenly graduated yard stick the EPA estimates are not.
Best Regards,
Shipo
I would say it is more the driver than the car. I know of one Accord in Illinois getting close to 48 MPG. That is extreme, yet how many hybrids in Chicago get that kind of mileage. Where was the vehicles in your chart tested. CA and AZ should not have any winter issues with mileage. Unless you are up in the Sierras. After 6200 miles in my TDI most on 2-3 mile trips with the AC running full blast (warm yr in SD) I have not seen a big fluctuation in mileage. 1-2 MPG on each tank difference. So AC on a diesel is not a factor that I can see. Maybe on small high revving gas engines it makes a difference.
Can a diesel car do this: turn on the ACC and run the air conditioner. Does it get cold? If not, then it requires FUEL to get cold. If it gets frigid with the car not started, then it's not using fuel. Gary, try that with your TDI and let us know.
From green car congress:
"Minimize Use Of Air Conditioning. Unless it’s freezing, or sweltering, keep the air conditioner off (fan is usually sufficient for cool or warm air flow into the vehicle). It is a major fuel thief in traffic, increasing fuel consumption by up to 10%."
The chart in question (which was removed because it was "too wide") was from a car in the Pacific Northwest of the USA.
"electric" A/C
Where does Prius get it's "electricity" from?
very little from regen - most from FUEL.
So anytime the A/C is running, it is still "in a roundabout way" using fuel.
No free lunches.....:D
Maybe that is because it is true. While cruising at 70 MPH at 2100 RPMS the TDI is at the peak of it's torque curve. In other words there is a lot more power than is needed to push the Passat down the highway. Unlike the inefficient gas engine that is very weak at lower RPMS. When you turn on the AC at 70 MPH you have to give it considerably more gas to maintain the speed and the AC. Diesel is a superior fuel for vehicles without any doubt. No amount of hype can change those FACTS.
Getting back to my original post. I am not the one relating that my hybrid gets 10, 20, 30% less mileage in the Summer and the Winter. Hybrids are just more susceptible to little outside influences. Heat, cold, wind, tire pressure, driving skill, etc. When the emphasis for owning a car is the mileage you get, it becomes a big issue. Also on my wife's LS400. We get 27 MPG on the highway year round. Mostly trips to Las Vegas across the desert. It seems to me the only engines that suffer when using the AC are the small low torque engines designed to get optimum mileage under very restricted circumstances.
On what are you basing that assumption? Gut feeling? It's a FACT that use of the air compressor requires fuel, regardless of the engine size. That's not different in any car.
It's a major factor in why the EPA tests, which DO NOT USE THE Air Conditioner, are incorrect for 87% of cars.
Diesel torque has nothing to do with fuel used to air condition a car.
Did you do your test, Gary, the one I suggested to you? Get in your TDI on a warm day and turn the key to ACC and run the air conditioner. Does it get cold? If not, then the engine must be running for it to get cold. What's the difference you say? Well, FUEL is being used by the air compressor to cool the air.
Found a page that says running the A/C generally robs 5% of an engines HP:
"If a car has 100 horsepower, the five-horsepower cost in engine power for running the air conditioner doesn't seem that great. However, the same car at cruising speed requires only 25 horsepower at the most. Then, relatively speaking, that five horsepower represents a much larger demand on the engine."
Found yet another page that says this:
"According to the National Safety Council’s Safety and Health Policy Center, driving without using the car’s air conditioning increases fuel efficiency by about 2.5 miles per gallon."
Another:
"The common automobile air conditioner uses shaft work of the engine to turn a mechanical compressor. Operating the mechanical compressor increases the load on the engine and therefore increases fuel consumption, emissions and engine operating temperature. "
I will have to differ unless you have some documented proof to the contrary. I am sure your 5% loss was based on a gas engine. As an example when driving the Mazda 626 and I turn on the AC I can feel the loss of power. When I do the same in the Passat TDI there is no loss. It all has to do with where your power curve produces the maximum. If you are cruising along in a 4C gas car at 2000 RPMS that is about half of the horse power you have at 4000 RPMS. So any little drag on the engine will be felt. I can tell you that I am getting the same mileage now as in the heat of the summer here. Many days over 95 degrees. Mostly short trips.
What I am seeing is a lot of excuses made for the hybrid technology and why it is not delivering the expected mileage. I agree with those that feel it should stand on it's own merit and not the skill of the hypermiler. As we know hypermiler's get great results without the aid of hybrid technology.
Maybe some sort of hypermiling course should be added to the curriculum of driver's ed classes in school. That would probably have a bigger impact on our oil supply than the over complicated hybrid technologies.
Yeah, but we're, like, really hot see.
I am sure that is gasoline not diesel that is used. Just another reason to switch to a diesel car. My VW TDI is happy to run the AC without wasting fuel. Oh, and my GMC hybrid with climate control keeps pouring out the cold air with the engine stopped at the stop lights. Does your HCH do that?
Cruising @ 70MPH you don't notice if the A/C is on with an HCH in regards to engine load.
"Diesel is a superior fuel for vehicles without any doubt. No amount of hype can change those FACTS"
How about diesel car hype?
Let's look at some facts:
*Diesel cars have a much shorter life span than gasoline cars. Used car listings are solid proof.
www.autotrader.com
*Diesel fuel is considerably more expensive and is harder to find than gasoline.
Proof is at your local gas station (Which probably doesn't even sell diesel)
*Diesel cars, particularly VW continues to be plagued by gross failures from fires to steering parts falling off
http://money.cnn.com/2004/11/08/pf/autos/cr_auto_reliability/
*Jetta reminds me alot of a '76 Chev Citation
http://www.canadiandriver.com/articles/tw/images/81citation.jpg
But I guess beauty is in the eye of the beholder.
Gagrice this is not a diesel vs hybrid thread (But you can see I'm glad to filter out the hype).
I understand there's a few people getting almost 70MPG from their '06 HCH over at that "Green" website.
Any vehicle that can get over 50MPG is great in my book (Diesel included) but 70MPG is simply fantastic, especially from a gasoline powered car.
I see someone is getting 52.9 MPG which is good. I am sure you have followed this thread, and the debate is why so many hybrid owners are disappointed in the mileage during the summer and winter. What do you attribute the 10-30% loss in mileage during the extreme heat or extreme cold. I know in Atlanta it is 75 degrees year round so that is not an issue with your driving.
You could start by uploading your own FE figures over at GH so we can see your real world FE? Someone complaining about others FE should not mind the rest of us seeing his or hers. So far, all I hear is that your Lexus gave you this, the TDI that, or the Silverado Hybrid hasn’t seen its first tank and its 4 months old, etc
You know my hybrids and non-hybrid’s FE to the last mile/ounce as I post them but where is yours so we can see the disappointment tank over tank in your non-hybrids too? If most non-hybrid drivers kept track of their FE tank over tank, they would be ashamed to post their results! If you think a Hybrid not hitting the EPA in the dead of winter or heat of summer is bad, try a Chevrolet Impala, Toyota Tundra, Ford Crown Vic, or Honda Odyssey in a 7 mile commute of downtown stop and go. When you see 10 or less mpg’s tank after tank after tank, you would be glad to own the Prius, HCH, or FEH receiving their paltry 25 - 45 + mpg in that exact same driving scenario and circumstance.
Finally, a quick look over CR’s Annual Car Buyers Guide issue will show you what the non-hybrid’s are capable of in a stop and go city environment according to CR’s own testing. This is not done in the dead of winter either! The Accord is worth just 16 mpg according to CR’s and I know a few I4 Accord owners in downtown Chicago that wish they could achieve that high a FE this time of year. Remember that the Accord is one of CR’s highest FE rated non-hybrid automobiles available with a 38 mpg highway rating
Older report but still relevant: http://autos.yahoo.com/consumerreports/article/fuel_efficient_cars_category.html-
Good Luck
Wayne R. Gerdes
I have never owned a truck that got 10 MPG or less. My Suburban was a 13-14 MPG around town rig. It would get 17 MPG on the highway. My new hybrid had 670 miles when I filled it yesterday. Didn't bother to figure the mileage. Somewhere around 15 MPG. I like driving the truck, just trying to get miles on the VW TDI to sell it. I have the VW on a spreadsheet. After 6123 miles the Passat is at 27.96 MPG. Most of that is trips shorter than 3 miles.
Now back to the point at hand. You can bet your bottom dollar if I bought a Prius and it only got 35 MPG when it has an EPA of 55 MPG combined, I would be upset. If a car cannot get close to EPA with normal driving. NO hypermiler technics. It is not something I would be interested in. That is why I bought the Passat. It gets what it is advertised to get. It gets better in town than I expected.
I read from hybrid owners every excuse under the sun why they are not getting EPA. That is fine for them. I would not be happy. The truth is and I think you have proven it to yourself and surely to me. If mileage is a big concern in your driving, you can get great mileage out of most anything you drive. I don't put enough miles on my vehicles to worry about the fuel I use. Insuring one vehicle costs more than gas for all 4 cars in a year.