Does your OBC MPG constantly change and update?

AsherG · 10-07-2011, 03:58 AM

Just wondering how yours works as it seems like mine stops updating after x period of time resulting in me having to reset it to get an updated reading.

Cheers,

Ash

xenon · 10-07-2011, 03:58 AM

It's because it does average.....

gIzzE · 10-07-2011, 04:02 AM

Quote:

Originally Posted by AsherG

Just wondering how yours works as it seems like mine stops updating after x period of time resulting in me having to reset it to get an updated reading.

Cheers,

Ash

You winding us up??

Do you get what 'average' means and why it will change quicker after a reset and slow down the more miles you put on it?

AsherG · 10-07-2011, 04:07 AM

gIzzE, keep your hat on, ill explain a little more.

The OBC for example displayed 32MPG after say 20 miles of town driving. I then drove from Birmingham to Leicester, cruise control set at 70 and whilst the MPG gauge on the dash showed closer to 50MPG, the OBC didn’t budge for the whole journey...

Just thought it would have improved the average, albeit just a little.

creepy coupe · 10-07-2011, 04:13 AM

Quote:

Originally Posted by AsherG

gIzzE, keep your hat on, ill explain a little more.

The OBC for example displayed 32MPG after say 20 miles of town driving. I then drove from Birmingham to Leicester, cruise control set at 70 and whilst the MPG gauge on the dash showed closer to 50MPG, the OBC didn’t budge for the whole journey...

Just thought it would have improved the average, albeit just a little.

When I had my E92 30d I found the MPG settled down quickly, more so than the petrols. The diesels like a constant throttle EG motorways, on and off boost through the lanes, they don't fair so well.

gIzzE · 10-07-2011, 07:20 AM

Sorry, didn't mean it come across like that.

After 20 miles of city driving at an average of around 30mpg you will only see that rise by about 2mpg by the time you get to Leicester if you sit at say 80mph.
And where in Leicester, did you come off the m69 and just hit Fosse Park? Or did you go into town and hit all the lights on the Humberstone road? If you did that then the slight gain you got on the motorway would soon be lost.

Next time reset the obc has you hit 80 on the motorway and see what it says after 20 miles. When lived in the city my 320d averaged 33.8, when I moved out and had a 1 mile trip to the motorway it shot up to 39mpg average. Whe we got our second shop umat the coast which meant loads of 80 mile trips at 50-60mph it the went to 46mpg.

Hopefully that is a bit less of a smarmy answer? Sorry.

HighlandPete · 10-07-2011, 03:33 PM

Yep, it takes a lot of miles to get a better average once a good few miles are logged into the data.

One thing that makes it worse in a BMW, is the conversion is only calculaed at 0.1 litre increments, so as we note, we don't get say; 30.1, 30.2 30.3 mpg, etc. Therefore we need a bigger mpg change before we get an update. Often lost in mixed driving, or over long averages.

Cars like the VAG range have finer incremental updates, at 0.1mpg.

HighlandPete

AsherG · 10-07-2011, 06:15 PM

Thanks for the answers guys, I understand it much clearer now!

Ive only had this car for coming on 2 weeks and there are so many little features to get my head around, there hasnt been a day I havnt learnt something. Lets see how long it keeps up.

AsherG

m1bjr · 10-08-2011, 05:08 PM

Have you unlocked it by pressing the unlock button twice in succession then opening the door?

Thats handy in a tight parking spot

AsherG · 10-10-2011, 05:13 AM

Hi m1bjr,

Yes, found out about this by mistake and works a treat. I was wondering why sometimes the windows go halfway down when i open the doors so jumped straight on to my number one point for info...e90post...I found the answer in minutes.

I sometimes put the windows fully down to stop passengers using the glass to shut the door. I hate fingerprints. Especially on a Black car...

10-07-2011, 03:58 AM	#1
AsherG New Member 3 Rep 26 Posts Drives: e92 BMW 320d M Sport Black Join Date: Sep 2011 Location: Birmingham iTrader: (0)	Does your OBC MPG constantly change and update? Just wondering how yours works as it seems like mine stops updating after x period of time resulting in me having to reset it to get an updated reading. Cheers, Ash
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10-07-2011, 03:58 AM	#2
xenon Major General 1396 Rep 8,082 Posts Drives: 2021 G21 330i M-Sport Join Date: Jun 2008 Location: Coventry iTrader: (0)	It's because it does average..... __________________ Ian Current: 2021 G21 330i M-Sport Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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10-07-2011, 04:07 AM	#4
AsherG New Member 3 Rep 26 Posts Drives: e92 BMW 320d M Sport Black Join Date: Sep 2011 Location: Birmingham iTrader: (0)	gIzzE, keep your hat on, ill explain a little more. The OBC for example displayed 32MPG after say 20 miles of town driving. I then drove from Birmingham to Leicester, cruise control set at 70 and whilst the MPG gauge on the dash showed closer to 50MPG, the OBC didn’t budge for the whole journey... Just thought it would have improved the average, albeit just a little.
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10-07-2011, 07:20 AM	#6
gIzzE Major General 363 Rep 5,984 Posts Drives: F11 + 911 C4 Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	Sorry, didn't mean it come across like that. After 20 miles of city driving at an average of around 30mpg you will only see that rise by about 2mpg by the time you get to Leicester if you sit at say 80mph. And where in Leicester, did you come off the m69 and just hit Fosse Park? Or did you go into town and hit all the lights on the Humberstone road? If you did that then the slight gain you got on the motorway would soon be lost. Next time reset the obc has you hit 80 on the motorway and see what it says after 20 miles. When lived in the city my 320d averaged 33.8, when I moved out and had a 1 mile trip to the motorway it shot up to 39mpg average. Whe we got our second shop umat the coast which meant loads of 80 mile trips at 50-60mph it the went to 46mpg. Hopefully that is a bit less of a smarmy answer? Sorry.
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10-07-2011, 03:33 PM	#7
HighlandPete Lieutenant General 6659 Rep 15,858 Posts Drives: BMW F11 535i Touring Join Date: Mar 2007 Location: Scotland, Highland Region iTrader: (0)	Yep, it takes a lot of miles to get a better average once a good few miles are logged into the data. One thing that makes it worse in a BMW, is the conversion is only calculaed at 0.1 litre increments, so as we note, we don't get say; 30.1, 30.2 30.3 mpg, etc. Therefore we need a bigger mpg change before we get an update. Often lost in mixed driving, or over long averages. Cars like the VAG range have finer incremental updates, at 0.1mpg. HighlandPete
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10-07-2011, 06:15 PM	#8
AsherG New Member 3 Rep 26 Posts Drives: e92 BMW 320d M Sport Black Join Date: Sep 2011 Location: Birmingham iTrader: (0)	Thanks for the answers guys, I understand it much clearer now! Ive only had this car for coming on 2 weeks and there are so many little features to get my head around, there hasnt been a day I havnt learnt something. Lets see how long it keeps up. AsherG
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10-08-2011, 05:08 PM	#9
m1bjr LSD - No, you're not seeing things 72 Rep 3,302 Posts Drives: Baby F36 Gran Coupe Join Date: Mar 2010 Location: Plymouth UK iTrader: (4)	Have you unlocked it by pressing the unlock button twice in succession then opening the door? Thats handy in a tight parking spot __________________
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10-10-2011, 05:13 AM	#10
AsherG New Member 3 Rep 26 Posts Drives: e92 BMW 320d M Sport Black Join Date: Sep 2011 Location: Birmingham iTrader: (0)	Hi m1bjr, Yes, found out about this by mistake and works a treat. I was wondering why sometimes the windows go halfway down when i open the doors so jumped straight on to my number one point for info...e90post...I found the answer in minutes. I sometimes put the windows fully down to stop passengers using the glass to shut the door. I hate fingerprints. Especially on a Black car...
	Appreciate 0 Quote