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Do you get the EPA MPG?
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CarGuru > Driving > Do you get the EPA MPG? 2 May 2005 01:06:08

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Do you get the EPA MPG?

Magnulus 28 April 2005 09:52:42
 http://motortrend.co­m/features/news/112_­news004/

Some folks are saying the EPA's MPG figures are inaccurate and that they
should be changed. I disagree.

My car is rated 36/45, and I get about 36-41 miles per gallon (I measure
the mileage when I fill up the tank) with very little "highway" driving. So
just how are people driving if they can't get the EPA's numbers?

I think the EPA figures are a good metric, if you understand the
limitations of the test (cars don't have to drive under 60 miles per hour
any more). So what's so hard to understand? "Your mileage may vary"?


Add comment
Brent P 28 April 2005 10:28:36 permanent link ]
 In article <rQ_be.9089$lf2.316­2@bignews6.bellsouth­.net>, Magnulus wrote:> http://motortrend.c­om/features/news/112­_news004/>
Some folks are saying the EPA's MPG figures are inaccurate and that they> should be changed. I disagree.

All that the EPA MPG figure has to be is consistant. That's it. To
compare apples to apples. Driving styles and particular cars are way too
varied to achieve accuracy for any one buyer.




Add comment
Magnulus 28 April 2005 11:36:41 permanent link ]
 
"Brent P" <tetraethylleadREMO­VETHIS@yahoo.com> wrote in message
news:ZsKdnThgo40JH-­3fRVn-vQ@comcast.com­...> All that the EPA MPG figure has to be is consistant. That's it. To> compare apples to apples. Driving styles and particular cars are way too> varied to achieve accuracy for any one buyer.

Exactly, but my point is the EPA figures are do-able in the real world-
IF you consider the conditions of the test (under 60 miles per hour
driving). If people aren't getting the EPA numbers, it is probably due to
driving style or driving conditions. People may think they are driving
highway driving when they are actually closer to city driving, or they drive
with more acceleration than it needed, and they brake late and don't
anticipate stops, etc. And if you buy "comfort" tires, of course it's
going to use more miles per gallon than getting the harder performance or
low rolling resistance tires.

The only arguement I have seen against the EPA rules that is legitimate is
that hybrids in the EPA tests have full batteries, whereas in the real world
if you start off with a battery that is somewhat drained, it could use up
some power/efficiency (in the Prius/Escape, it will actually run the engine
to recharge the battery- in the Hondas, it will be less a problem unless it
gets really low, then the battery stops extra electrical power- the battery
is not empty, it just won't let you get any more juice- and you just have to
use extra engine power). So, in a general sense, hybrids are very dependent
on driving style . Driving in such a way that keeps the battery topped up
gives the best fuel economy.

Also, hybrids might experience worse fuel economy in severe winter
conditions because the batteries can't store as much power in the cold
(Priuses in Canada might get low 30's MPG, for instance, in the winter).
This works with regular gasoline and diesel vehicles too, though, because
winter fuel often has oxygenates or anti-gel additives (such as kerosene)
that have less energy value- but it's a less extreme penalty. They add
oxygenates (usually ethanol, much lower BTU's than gasoline) to gasoline
because catalytic converters that are cold don't perform as well, which
means they'll be polluting more.


Add comment
Thomas Schäfer 28 April 2005 12:21:13 permanent link ]
 I drive in Europe, so I compare with the similar
european driving cycle MVEG 93/116/EG.

The mileage indicated by this cycle is realistic if you
imagine the low urban top speed of 120kph (75mph),
the unneccessary idling and medium revs (instead of low revs).

You can easily get a mileage much lower than the EU ratings,
if you drive your high performance car with +250kph on the
autobahn.
But you can also get a higher mileage (like I always do).

Everey car must be preconditioned with the same cycle
until the car parameters stabilize.
So there is no problem with hybrids, they can't draw more
energy from the batterie than they will charge.
But nevertheless, they excell in the european cycle too.

Thomas


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L Sternn 28 April 2005 17:52:58 permanent link ]
 On Thu, 28 Apr 2005 01:52:42 -0400, "Magnulus"
<magnulus@bellsouth­.net> wrote:
Some folks are saying the EPA's MPG figures are inaccurate and that they>should be changed. I disagree.>

they've ALWAYS been inaccurate.
My car is rated 36/45, and I get about 36-41 miles per gallon (I measure>the mileage when I fill up the tank) with very little "highway" driving. So>just how are people driving if they can't get the EPA's numbers?>

WTF do you drive?
I think the EPA figures are a good metric, if you understand the>limitations of the test (cars don't have to drive under 60 miles per hour>any more). So what's so hard to understand?


Nothing hard to understand at all
"Your mileage may vary"?>

Add comment
Timothy J. Lee 28 April 2005 21:11:43 permanent link ]
 In article <mm0ce.139589$vL3.1­06324@bignews4.bells­outh.net>,
Magnulus <magnulus@bellsouth­.net> wrote:>And if you buy "comfort" tires, of course it's>going to use more miles per gallon than getting the harder performance or>low rolling resistance tires.

The top performance tires (typically with speed ratings higher than V
or 130mph) tend to have softer, sticker compounds that are not low
rolling resistance. In lower speed ratings (S, T, H, V), there are
tires with more and less rolling resistance (car companies often choose
the low rolling resistance tires to get better fuel economy numbers;
these tires may or may not be good otherwise).

But many drivers don't make sure that there is sufficient air in whatever
tires they do have, so they get worse fuel economy, worse handling / safety,
and worse tread wear than if they kept the tires properly inflated.

--
-------------------­--------------------­--------------------­-------------
Timothy J. Lee
Unsolicited bulk or commercial email is not welcome.
No warranty of any kind is provided with this message.
Add comment
Timothy J. Lee 28 April 2005 21:20:02 permanent link ]
 In article <rQ_be.9089$lf2.316­2@bignews6.bellsouth­.net>,
Magnulus <magnulus@bellsouth­.net> wrote:>http://motor­trend.com/features/n­ews/112_news004/>
Some folks are saying the EPA's MPG figures are inaccurate and that they>should be changed. I disagree.

They probably overstate fuel economy for the "typical" driver who:

* drives in a very jerky style with late braking, foot to the floor
acceleration (into a traffic jam that s/he will soon have to brake
for)
* has underinflated tires
* has not done regular maintenance on his/her car
* has a car with an automatic transmission (what little I have seen
indicates that it is harder to match of beat EPA numbers with an
automatic than a manual)
* drives on "highways" that are very congested

But (except for possibly the last item above) the conditions listed
are easily avoided, so it is quite possible to beat the EPA fuel
economy numbers (since they are derated by 22% for highway and 10%
for city to compensate for the 1970s assumptions about speeds and
acceleration).

--
-------------------­--------------------­--------------------­-------------
Timothy J. Lee
Unsolicited bulk or commercial email is not welcome.
No warranty of any kind is provided with this message.
Add comment
S Narayan 28 April 2005 22:44:59 permanent link ]
 
"Magnulus" <magnulus@bellsouth­.net> wrote in message
news:mm0ce.139589$v­L3.106324@bignews4.b­ellsouth.net...
The only arguement I have seen against the EPA rules that is legitimate
that hybrids in the EPA tests have full batteries, whereas in the real
world> if you start off with a battery that is somewhat drained, it could use up> some power/efficiency (in the Prius/Escape, it will actually run the
engine> to recharge the battery- in the Hondas, it will be less a problem unless
gets really low, then the battery stops extra electrical power- the
battery> is not empty, it just won't let you get any more juice- and you just have
use extra engine power). So, in a general sense, hybrids are very
dependent> on driving style . Driving in such a way that keeps the battery topped up> gives the best fuel economy.>
Also, hybrids might experience worse fuel economy in severe winter> conditions because the batteries can't store as much power in the cold> (Priuses in Canada might get low 30's MPG, for instance, in the winter).> This works with regular gasoline and diesel vehicles too, though, because> winter fuel often has oxygenates or anti-gel additives (such as kerosene)> that have less energy value- but it's a less extreme penalty. They add> oxygenates (usually ethanol, much lower BTU's than gasoline) to gasoline> because catalytic converters that are cold don't perform as well, which> means they'll be polluting more.>

The link below should clarify a few things, hopefully.
http://www.greenhyb­rid.com/learn/articl­e/5-why-cant-i-match­-epa-mileage-figures­.html

Prius EPA numbers are 51 hwy, 60 city and 55 combined.
For the record, I have averaged 50mpg even over 20k miles of mixed driving
(leaning more towards highway). Seems to be quite acceptable. Temperature
has a big impact as well, our average ambient temperatures are close to 15C
which will lower overall mileage for any car.


Add comment
Magnulus 28 April 2005 23:16:14 permanent link ]
 
"L Sternn" <lincolnfs@hm.net> wrote in message
news:hkq171ptqptbdf­h4r7gkof767f4nec9i04­@4ax.com...> WTF do you drive?

VW Jetta wagon TDI.


Add comment
L Sternn 29 April 2005 03:30:22 permanent link ]
 On Thu, 28 Apr 2005 15:16:14 -0400, "Magnulus"
<magnulus@bellsouth­.net> wrote:
"L Sternn" <lincolnfs@hm.net> wrote in message>news:hkq171­ptqptbdfh4r7gkof767f­4nec9i04@4ax.com...>­> WTF do you drive?>
VW Jetta wagon TDI.>

But I forgot - you're a sloth
Add comment
Arif Khokar 29 April 2005 03:54:38 permanent link ]
 Magnulus wrote:
My car is rated 36/45, and I get about 36-41 miles per gallon (I measure> the mileage when I fill up the tank) with very little "highway" driving. So> just how are people driving if they can't get the EPA's numbers?

My car has an EPA mpg rating of 17/24 City/Highway. If I do just city
driving for an entire tank, I usually get 17 to 18 mpg. If I do highway
driving for an entire tank at lower speeds 65 to 70 mph, I get around 26
mpg. If I do highway driving for an entire tank at higher speeds, I get
around 24 mpg.

I try to keep my tire pressure around 39 psi front, and 37 psi rear
(recommended is 38/36). I have vehicle maintenance performed at
intervals specified in the owners manual.
Add comment
James C. Reeves 29 April 2005 05:49:28 permanent link ]
 
"Magnulus" <magnulus@bellsouth­.net> wrote in message
news:rQ_be.9089$lf2­.3162@bignews6.bells­outh.net...> http://motortrend.c­om/features/news/112­_news004/>
Some folks are saying the EPA's MPG figures are inaccurate and that they> should be changed. I disagree.>
My car is rated 36/45, and I get about 36-41 miles per gallon (I measure> the mileage when I fill up the tank) with very little "highway" driving. > So> just how are people driving if they can't get the EPA's numbers?>
I think the EPA figures are a good metric, if you understand the> limitations of the test (cars don't have to drive under 60 miles per hour> any more). So what's so hard to understand? "Your mileage may vary"?>

EPA ratings have been fairly accurate for me for years. I generally get
1-2MPG better than the EPA rating for city and about 2-3 MPG better than
rated on the highway over the last several cars/vans/trucks I've had.
Currently:

Sebring...Rated 21/29. I average 23/31 (Best was 32)
Malibu...Rated 20/28. I average 19/32 (Best was 34)
Caravan...Rated 18/24 . I average 19/27 (Best was 29)

The wife has a Stratus. It's rated the same as the Sebring. She averages
23/26. But then she does 80 MPH + on most road trips when she can (I
don't)...which explains why she gets 2MPG *under* EPA rating, I suppose.





Add comment
Garth Almgren 29 April 2005 21:39:54 permanent link ]
 On 4/28/2005 4:30 PM, L Sternn wrote:
On Thu, 28 Apr 2005 15:16:14 -0400, "Magnulus"> <magnulus@bellsouth­.net> wrote:>
"L Sternn" <lincolnfs@hm.net> wrote in message>>news:hkq17­1ptqptbdfh4r7gkof767­f4nec9i04@4ax.com...­>>
WTF do you drive?>>
VW Jetta wagon TDI.>
But I forgot - you're a sloth

And a stinky one, at that.


--
~/Garth |"I believe that it is better to tell the truth than a lie.
Almgren | I believe it is better to be free than to be a slave.
******* | And I believe it is better to know than to be ignorant."
(pgp@v6stang.com for secure mail info) --H.L. Mencken (1880-1956)
Add comment
Garth Almgren 30 April 2005 00:11:52 permanent link ]
 On 4/29/2005 11:38 AM, gcmschemist@gmail.c­om wrote:
Garth Almgren wrote:>
And a stinky one, at that.>>
Another irrational diesel-hater pipes up.

My use of "stinky" wasn't meant in a negative way. Stinky as in "a
distinct and noticeable odor that many find unpleasant."

Actually, I love the smell of a diesel, especially marine diesel engines
and cabin heaters.



--
~/Garth |"I believe that it is better to tell the truth than a lie.
Almgren | I believe it is better to be free than to be a slave.
******* | And I believe it is better to know than to be ignorant."
(pgp@v6stang.com for secure mail info) --H.L. Mencken (1880-1956)
Add comment
K Smythe 30 April 2005 02:55:21 permanent link ]
 On Fri, 29 Apr 2005 15:14:33 -0700, Garth Almgren <nospam@v6stang.com­>
wrote:
On 4/29/2005 1:22 PM, gcmschemist@gmail.c­om wrote:
Well, a few months ago I had many thousands of dollars worth of sinus >surgery. I'm noticing smells now that I never knew existed. :)­

I remember when I regained some of my sniffing power.

The world stinks, and much of it is not in a good way.
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CarGuru > Driving > Do you get the EPA MPG? 2 May 2005 01:06:08

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