Fuel economy and remaps on a 2005 120d sport auto

[EB89]

Hi all,
I recently acquired a 2005 120d sport auto. It does have 160k on the clock, but complimented by FMDSH.
I have been a little disappointed by the fuel economy and it seems way behind the book figures below. For example I did a 90% motorway, 220 miles trip on Friday with no traffic at all, not exceeding 70mph, no traffic and economic driving style and only returned 41mpg. Same on the way back a few days later.

Just wondered if this was normal, if anyone has found something (other than driving style) to improve this?
Also interested to hear if people have seen a notable improvement with remaps as this is something I am looking at too.

TIA

[helix402]

Give it a full service. Probably needs thermostats too.

[PTF]

My E92 325i 3.0 (N53) did 43mpg on a 300 mile round trip to preston and back the other week. Sat at 70-80 the whole way

[chrisgeary]

Also, it's winter so expect ~10% lower mpg than summer.

[bigdom]

As per Helix, full service, include all filters including crankcase breather. Check thermostat temps, and replace if required. For reference, at those speeds, my 535d does around 48mpg on the dash.

[smashy]

http://babybmw.net/forum/viewtopic.php?f=11&t=... some chat on your engine the pre facelift

[gizlaroc]

We had a 55 plate 120d M-Sport auto back in 2006, bought at 10 months old with 12k miles on it.

It used to average 33.6mpg no matter what, best run I ever had was 42mpg in Scotland, but no matter how much you reset the OBC, after a week or two it would end up back at 33.6. Round town from cold it would be about 26mpg.

There was lots of disappointed owners on the forum back then that were convinced there was something wrong with their cars, but mid thirties average seemed to be the norm.


Having said all that I loved mine, I put a DTUK tuning box on it and it was a great car, we kept it for 2 years and 50k miles and in the end swapped for a 123d. I actually preferred the 120d in lots of ways.