High fuel consumption after fitting new battery

[RonCT]

Hi Guys,

Since buying the car in 2012, I have never had to replace the battery. I've had to jump start it a few times, but the car never lost complete electrical power.

The car has always had a fuel consumption of between 9.2. and 9.9 depending on how hard I drive it.

In December, I fitted a brand new battery from BMW. I replaced it myself and the car was without any battery power for several minutes while I was swapping out the battery.

Now the car has consistently been between fuel consumption 11.2 and 11.9. I thought it may take a few hundred Km's for the computer to get an average reading, but it's been 2 months and I'm starting to think that I've reset some setting or mapping that is causing my consumption to be higher???

Does anyone have any ideas or what steps I can take to investigate this further?

Thanks in advance.

 

[Lizzard]

Is this in the same conditions as before, same road conditions, same traffic, same highway or city driving?

And what car are we referring to here if I may ask?

 

[ChefDJ]

I think its paranoia.

Reset OBC settings and go for a long drive on a highway and report back.

 

[Crash_Nemesis]

This may be a stab in the dark, but it could very well be that your old average of 9.7 was over many thousands of KM, whilst your new average is over a shorter distance. It should eventually come down and equalize.

Same happened with my M3. I was used to having an average of 10.5-11 over a couple thousand km. Changed the battery and now with only doing a few hundred km I sit at 12.5-13. With highway driving that number starts dropping slowly. It should eventually even out at high tens again. My 2 cents.

 

[RonCT]

Hi Guys,

Thanks you for your quick responses, much appreciated:

Lizzard: This is the exact same conditions (highway driving to work and back), same route etc.
Car is 2004, Z4, 3.0, Automatic (not smg), 60 000km on the clock

ChefDJ: I have reset the OBC (I select the consumption setting and click "recalculate") and have driven a short distance ie: 50km at a time before switching off the ignition and same. It's been about 300km - 400km since I did this. I will report back after more km's.

Is there another "reset" function for for the OBC, other than the "recalculate" function?

Crash_Nemesis: Thanks for your input, I also hope it evens out/equalises.