Weak MPG - F10 525d

[un1corn]

Just wondering if anyone else has this vehicle/engine? It's the later 2.0 twin turbo.

I'm getting a consistent 34mpg at the moment, which in my opinion is ste. I've put it down to maybe the cold weather, but am uncertain. It's only 3 years old and has done 36k.

I was hoping for at least 40mpg. I do about 20 miles daily, no stop/start traffic, all 40/50/70mph roads. This 34 is with careful driving in eco or comfort mode. It'll drop to 28/29 in sport mode with a hammering.

Is this normal?

[bigdom]

Sounds light, my 535d would see better mileage for that journey. I'd start with thermostat temperatures and go from there.

[scz4]

That does seem very low.

I sold my 525d F11 last March, owned it for almost 4 years. I used to average 40mpg on my 8 mile country commute, could see 48-50mpg on a decent A class road run and mid 40's on a dual carriage\motorway. Overall mpg was around 42/43mpg over 40k miles. Never used eco mode.

Previously had a E61 530d and that would struggle to see late 20's.

[apotts]

Spritmonitor shows an average of 38 mpg (69 cars).

20 miles a day - is that a commute of 10 miles each way? If so, half the miles will be done with the car below optimum temperature and busy guzzling the fuel.

[apotts]

Link: https://www.spritmonitor.de/en/overview/6-BMW/0-Al...

[VerySideways]

Winter diesel has additives to prevent the stuff sludging up in cold temperatures - summer diesel will give you better fuel economy anyway.

And as has already been mentioned, check the thermostat to make sure it's not stuck open. I think there's a hidden menu you can get into (?) so use that to watch the temp as you do your normal drive and see how long it takes to get up to temp, and what temp it gets to.

[apotts]

https://www.youtube.com/watch?v=1QN2FR9A08M

[un1corn]

I'm gonna put it down to short journey. The 20 miles commute is 10 miles each way.

I did a 380 mile round trip today on the motorway. Half of it was at about 80mph and the other half at 50mph average speed camera zones.

49mpg.

Cheers for the help anyway chaps, I'll just have to tolerate it.

[Lowtimer]

That 49 mpg sounds like there's nothing fundamentally wrong. Still worth checking the thermostat though, it might be sticky and causing the car to warm up from cold more sluggishly than it should.