2013 F20 125d - Poor MPG

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BeemerCheemer
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2013 F20 125d - Poor MPG

Post by BeemerCheemer » Sun Feb 10, 2019 11:03 am

Hi all,

New member here, having just bought a 2013 F20 125d with 60k mileage in VO.
Having driven it for just over a month, am a little concerned as it seems to be averaging 30-32Mpg with a mixed variety of driving, mainly motorway / bypass miles. I drive quite conservatively, but do use sport mode all the time.

Have filled up twice now to the brim and achieved 340miles each tank. Looking online and through other posts this is obviously significantly lower than the 500+ miles per tank that others report.

There’s no EML present, have scanned the car using Carista and no error codes present (apart from a brake wear sensor). Car doesnt feel to be hesitating or misfiring and there’s most definately no loss of power, if anything it feels more powerful than the 218bhp it should be pushing out.

Im suspecting that the car could have been remapped (albeit badly) by a previous owner. It feels a lot faster than what you’d expect 218bhp as standard to deliver (moved from a Mk5 Golf R32 to the 125d)... and the stop/start appears to have been coded out.

Can anyone offer any advice?

Thanks in advance

Ross

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marco_polo
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Re: 2013 F20 125d - Poor MPG

Post by marco_polo » Sun Feb 10, 2019 11:07 am

125d are not known for their economy, they have very short gears.

How hot is the coolant getting? It should get up to 88C pretty quickly, even in winter.

Tyre pressures all correct? All brake discs the same temp? (Dragging callipers are quite common, unless you have the good blue Brembo brakes?)

A remap shouldn't really hurt the mpg when commuting normally, it will only squirt in extra fuel when you're enjoying yourself.
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BeemerCheemer
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Re: 2013 F20 125d - Poor MPG

Post by BeemerCheemer » Sun Feb 10, 2019 11:17 am

Unsure re: coolant temperatures, will check the menu after a drive later today and update.

Brake discs and pads are all new. No binding that I can tell. Its M spec, so has the blue calipers. Tyres all at same pressure too etc.

Did note that even when in comfort mode, lightly blipping the throttle causes mpg reading to drop as low as 8mpg even when warm.

Thanks

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Re: 2013 F20 125d - Poor MPG

Post by BeemerCheemer » Sun Feb 10, 2019 1:39 pm

So, from cold start, drove ~6miles or so at 45-50mph, pulled over and the readings from the hidden menu were;

O. Temp 5.8c
Coolant Temp 79c
Oil Temp 69c
O. Temp Sensor 24D ADC

Filled up completely, Miles to empty showed as 485Miles after fillup, reset the MPG computer and drove a 15 mile journey home in ecopro, 13miles motorway with cruise control 75mph, 2 miles 30mph roads. Trip computer showed avr. Mpg 33.9 when arriving home. Miles to empty now showing 453miles.

Thanks

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Re: 2013 F20 125d - Poor MPG

Post by marco_polo » Sun Feb 10, 2019 1:45 pm

Your engine's cold, coolant should be 88/89°C. Oil should get up to very roughly 100°C on a longer run.

I'd repeat your experiment over, say, 20 miles? If everything is still luke warm, it's time to look at your thermostat/s.
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Asbestross
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Re: 2013 F20 125d - Poor MPG

Post by Asbestross » Sun Feb 10, 2019 1:48 pm

Will give it a longer blast tomorrow and check back.

Thanks for your help, 'tis appreciated

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Re: 2013 F20 125d - Poor MPG

Post by Asbestross » Sun Feb 10, 2019 2:49 pm

Had to nip out anyhow and help my sister out.

~35 mile round trip;
Took about 10 minutes to get there, but coolant temps seemed to stay around 87-88c. When booting it, however it rapidly drops to 82-83c and slowly creeps back up. Oil temps seemed to remain at 99-100c and didnt go over.

Presume my thermostats are ok then? Would carbon build up on intake / EGR cause a crappy MPG? Cars also booked into BMW week after next for the EGR recall, so will see if that improves it any.

Cheers

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Re: 2013 F20 125d - Poor MPG

Post by marco_polo » Sun Feb 10, 2019 3:07 pm

It all sounds healthy enough then. :thumbs:
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Ezzra
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Re: 2013 F20 125d - Poor MPG

Post by Ezzra » Sun Feb 10, 2019 5:26 pm

Asbestross wrote:
Sun Feb 10, 2019 2:49 pm
Had to nip out anyhow and help my sister out.

~35 mile round trip;
Took about 10 minutes to get there, but coolant temps seemed to stay around 87-88c. When booting it, however it rapidly drops to 82-83c and slowly creeps back up. Oil temps seemed to remain at 99-100c and didnt go over.

Presume my thermostats are ok then? Would carbon build up on intake / EGR cause a crappy MPG? Cars also booked into BMW week after next for the EGR recall, so will see if that improves it any.

Cheers

I would chop it in for a M135i. You'll get better economy :D
"You cannot sedate, all that you hate".

rossco95
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Re: 2013 F20 125d - Poor MPG

Post by rossco95 » Fri Feb 22, 2019 12:44 am

You ever find out the issue Ross? Has your mpg improved since the recall?




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