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Re: Hybrids EPA fuel economy
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CarGuru > Technology > Re: Hybrids EPA fuel economy 21 April 2005 03:52:09
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Re: Hybrids EPA fuel economy

chris777 via CarKB.com 20 April 2005 06:39:56
 I seem to recall that ALL EPA fuel economy figures are derived solely based
on vehicle emissions (including hybrids) and that their aren't actually any
real world driving test to dertemin fuel economy actually done by either
the EPA, or the car manufacturers

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Tcs 20 April 2005 07:04:50 [ permanent link ]
 On Wed, 20 Apr 2005 02:39:56 GMT, chris777 via CarKB.com <forum@CarKB.com> wrote:>I seem to recall that ALL EPA fuel economy figures are derived solely based>on vehicle emissions (including hybrids) and that their aren't actually any>real world driving test to dertemin fuel economy actually done by either>the EPA, or the car manufacturers

You need to do better research.

1) vehicles emissions has nothing to do with EPI FE figures. Distance and
fuel consumed are the only items used for the calculation.

2) the driving is very much like real world conditions although car gear ratios
can be optimized to give better EPI FE figures than would be seen in the real
world.

Add comment
JazzMan 20 April 2005 07:48:49 [ permanent link ]
 chris777 via CarKB.com wrote:>
I seem to recall that ALL EPA fuel economy figures are derived solely based> on vehicle emissions (including hybrids) and that their aren't actually any> real world driving test to dertemin fuel economy actually done by either> the EPA, or the car manufacturers>

You heard wrong. You should upgrade your sources.

JazzMan
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Don Stauffer 20 April 2005 17:38:45 [ permanent link ]
 chris777 via CarKB.com wrote:> I seem to recall that ALL EPA fuel economy figures are derived solely based> on vehicle emissions (including hybrids) and that their aren't actually any> real world driving test to dertemin fuel economy actually done by either> the EPA, or the car manufacturers>
I was under the impression that the EPA tests, though done on a chassis
dyno, do a pretty good job of replicating real life driving. The speeds
are controlled to simulate a given route, and the load on the dyno
likewise. While it may not replicate a route that any one individual
drives, it does replicate A real world drive.
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James C. Reeves 21 April 2005 03:52:09 [ permanent link ]
 
"Don Stauffer" <stauffer@usfamily.­net> wrote in message
news:1114004327.36c­411f2afdb48d7e3ec00b­2ee11fbb7@teranews..­.> chris777 via CarKB.com wrote:>> I seem to recall that ALL EPA fuel economy figures are derived solely >> based>> on vehicle emissions (including hybrids) and that their aren't actually >> any>> real world driving test to dertemin fuel economy actually done by either>> the EPA, or the car manufacturers>>
I was under the impression that the EPA tests, though done on a chassis > dyno, do a pretty good job of replicating real life driving. The speeds > are controlled to simulate a given route, and the load on the dyno > likewise. While it may not replicate a route that any one individual > drives, it does replicate A real world drive.

The original rules also required that all loads and accessories that were
normally active and not able to be switched off by the driver be active
during the test. When GM started putting DRLs on their cars, they realized
(apparently) the disadvantage that the added load of the lights placed on
the alternator (which means more fuel required) during the tests and
petitioned and won an exemption to have their EPA tests done with the DRLs
switched off...even though the owner can't switch them off (for most
models). One could argue that GM's EPA numbers are less "real world" than
other manufacturers models for that reason alone.


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CarGuru > Technology > Re: Hybrids EPA fuel economy 21 April 2005 03:52:09
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