bmwspeed

Hi,

I drive very short distances in city.Can be it needs 18 l /100 km diesel?its winter by the way too cold -25 C

I meter not from BC but phisicaly(drive and refill and count) BC shows 18l /100 km when the speed is 19km/h

In highway my BC shows 6.5...7.0 l / 100km by driving with autopilot 90km/h .So if there is problem the consumption in higway would be high too???

Odometer secret test 5 shows consumption 14.5 l /100 km

What the reason for that? Oil is new,Air filter is new,tyres are ok,fuel is from good brand gas station,Engine like new, only 150.000 km run The car drives smooth no any vibration or etc.Turbo has power too.




Any experience ?advice ?

Thank you.

P.S. Is the big diference E60 and E61 consumption??? because E60 owners says they cars consumpt about 12 l/100km in town and less.

JasonH

I think the E60 and E61 fuel consumption will be pretty much the same.

However short journeys, cold weather and big engine diesel automatics make for very, very poor fuel consumption.

Your 18 l /100 km is 15.7 mpg (UK gallons) and at -25C with short journeys I'm not surprised.

1Animal1

Funny this as i was going to post a similar post...after replacing both my thermostats this weekend - 10 miles to work in traffic and my car bearly got to 80C (I had it to 90 over the weeekend so the theromostats work) - I'm going to change the temp sender next as my Audi S3 used to get to 90C within 2-3 miles, somethings obviously wrong


DIS is showing 21mpg

Theo

+1 Exactly, you've created the perfect storm for poor mileage with those circumstances, not to mention that it is detrimental to the cars 'health', even more so if not negated by frequent long range trips...

10 miles seems a bit long, do note that a big diesel inherently heats much,much slower than a smaller petrol engine like your S3. If ambient temps aren't too high and traffic is slow 10 miles isn't that much off to reach 90. To get from 80 to 90 in the first place you might also want to look at a third thermostat located in the transmission heat exchanger. A member here had to change it as well to get to the proper operating temp.

Good luck!

1Animal1

Thanks theo...It does get to temp as tested over the weekend - once there is goes between 88-96C which isn't stable but not beyond the realms i dont think?

I'll do a google for a fitting guide

bmwspeed

Today I changed main thermostat because I have it new. 2 month ago I changed EGR thermostat and it was 100% faulty.Temperature after change was OK.

The change for main thermostat I make for better luck for consumtion

1Animal1

Im glad i bought both tbh.... you need to remove the heat exchanger thingy for both so you may aswell get both done and replaced IMO