[dbs600]

I’ve been getting very poor fuel economy for the past three months.

I’d previously get an average of 10 mpg’s, but same dropped to 8.

Service engine light came on about a month ago and the dealer replaced an oxygen sensor.

I also complained of poor fuel economy, but the repair order came back stating no problem found and that there are additional fuel additives during winter months!? Strange, as I've never had this problem before.

Still getting 8 mpg’s and exceptionally pissed with BMW's constant denial of problems when I have any; doesn’t matter which dealer I use.

What should I do? Below 10 mpg’s is just not right, and upsetting.

Thanks.