do you think the DCT was re-tested by the EPA for fuel econ?

rai · 05-01-2008, 08:00 PM

all around (in reviews) I see the DCT is supposed to or does get better fuel econ yet people say it's got the same EPA fuel econ and GG tax.

Makes me wonder if BMW or the EPA didn't bother to re-test.

I mean EPA has nothing to gain if the DCT gets better econ and they re-test it they lose GG tax.

Not that I can do anything about it can't fight city hall but it would be nice if the DCT had some indication of it being re-tested even if it was a slightly higher HW rating.

Zed · 05-02-2008, 06:45 PM

Quote:

Originally Posted by rai

all around (in reviews) I see the DCT is supposed to or does get better fuel econ yet people say it's got the same EPA fuel econ and GG tax.

Makes me wonder if BMW or the EPA didn't bother to re-test.

I mean EPA has nothing to gain if the DCT gets better econ and they re-test it they lose GG tax.

Not that I can do anything about it can't fight city hall but it would be nice if the DCT had some indication of it being re-tested even if it was a slightly higher HW rating.

DCT may change the mpg, but not that much. The M3 would have to get an 'unadjusted mpg' of 22.5 to get the gg tax dropped. If it hit 21.5, it would only go down by $300. Big woop. Note, there is a formula to compute the 'unadjusted mpg', it isn't a straight value. Wikipedia has the info on that I think.

What really sucks about the gg tax is that things like the hummer, trucks, etc. are excluded from it due to weight.

Our wonderful idiotic government at work (and I mean that all-inclusively).

skierman64 · 05-03-2008, 01:02 AM

I don't know this for a fact, but I don't think it was retested.

JCtx · 06-01-2009, 11:39 PM

Quote:

Originally Posted by skierman64

I don't know this for a fact, but I don't think it was retested.

Probably because it's worse, no? Is it? Curious too.

jbtco · 06-02-2009, 03:07 AM

I suspect that DCT cars only appear to have better fuel economy because they are tested using the leanest auto programme which which changes up gears very early and I would think that it is not in practice used that much by M drivers in normal usage.

Dascamel · 06-03-2009, 05:42 PM

DCT auto modes are very conservative, it should help MPG not hurt it. Try shifting manually and beat the computers shift points for fuel economy. I have a feeling the computer wold win everytime.

Radiation Joe · 06-04-2009, 10:35 AM

The DCT is tested separately. It just happens to get approximately the same mileage.

r53s65e90 · 06-04-2009, 01:34 PM

If you average out the improvement reported on bmw.de for DCT you get the following:
((9.2/9)+(17.9/17)+(12.4/11.9))/3 = 1.04. So 14/20 becomes 14.54->15/20.78->21. Of course EPA cycle improvement may be less or more.

Do we get any money back?? Probably not since it is about the same.

05-01-2008, 08:00 PM	#1
rai Captain 55 Rep 649 Posts Drives: M3 coupe with DCT Join Date: Feb 2008 Location: maryland iTrader: (0)	do you think the DCT was re-tested by the EPA for fuel econ? all around (in reviews) I see the DCT is supposed to or does get better fuel econ yet people say it's got the same EPA fuel econ and GG tax. Makes me wonder if BMW or the EPA didn't bother to re-test. I mean EPA has nothing to gain if the DCT gets better econ and they re-test it they lose GG tax. Not that I can do anything about it can't fight city hall but it would be nice if the DCT had some indication of it being re-tested even if it was a slightly higher HW rating.
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05-03-2008, 01:02 AM	#3
skierman64 Brigadier General 127 Rep 3,071 Posts Drives: E92M3-E46M3-E46Wagon-E89Z4-E36 Join Date: Dec 2006 Location: Greater St Louis Metro area iTrader: (1) Garage List 1994 325is Race Car [0.00] 2011 BMW Z4 [0.00] 1998 M3 Coupe [0.00] 2008 M3 Coupe [0.00]	I don't know this for a fact, but I don't think it was retested. __________________ Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/LEFT]
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06-02-2009, 03:07 AM	#5
jbtco Captain 163 Rep 641 Posts Drives: F80 M3 Join Date: Nov 2008 Location: Scotland iTrader: (0)	I suspect that DCT cars only appear to have better fuel economy because they are tested using the leanest auto programme which which changes up gears very early and I would think that it is not in practice used that much by M drivers in normal usage.
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06-03-2009, 05:42 PM	#6
Dascamel Lieutenant Colonel 48 Rep 1,664 Posts Drives: 2008 e92 M3, 2010 e91 328i Join Date: Jul 2007 Location: Bakersfield, CA iTrader: (0)	DCT auto modes are very conservative, it should help MPG not hurt it. Try shifting manually and beat the computers shift points for fuel economy. I have a feeling the computer wold win everytime. __________________ 2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim 2010 E91 328i Space Gray,Black int, M sport, most options 2007 Montego Blue 335i (retired)
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06-04-2009, 10:35 AM	#7
Radiation Joe Veni Vidi Vici 89 Rep 2,750 Posts Drives: '11 JB/BBe-6sp-e90 Join Date: Jul 2008 Location: Macungie PA iTrader: (0) Garage List 2011 e90 M3-Sold [8.50] 2003 RS6 - Sold [0.00] 2009 e90 M3 - Gone [0.00] 2003 M3 SOLD [0.00] old 2002 [10.00]	The DCT is tested separately. It just happens to get approximately the same mileage.
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06-04-2009, 01:34 PM	#8
r53s65e90 8300 19 Rep 573 Posts Drives: r53 s65e90 Join Date: Mar 2009 Location: San Jose, CA iTrader: (0)	If you average out the improvement reported on bmw.de for DCT you get the following: ((9.2/9)+(17.9/17)+(12.4/11.9))/3 = 1.04. So 14/20 becomes 14.54->15/20.78->21. Of course EPA cycle improvement may be less or more. Do we get any money back?? Probably not since it is about the same.
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