My 530 had to rev up to 4,000 rpm to up-shift, otherwise, very sloppy. due to heavy body I guess... the inline-6 has higher torque and hp @ over 3,500 rpm. yeah? or I my heavy right feet is out of control?

I thought I can save some gas for buying a smaller engine but it ends up the same. I should have got the V8 instead, shouldn't I?

 

My last manual check found that I was doing 39.3 MPG actual and an average of 40.6 MPG on car computer. I would say that's pretty accurate for a computer vs the real life situation.

Works out at just over 3% differential..

 

 

My computer on my 545i reads 15.1 mpg

 

I did a comparison between MPG (US) from the computer and MPG calculated from the fuel/mileas for both my 545i and the new 530i.
The cimputer on the 545i was about 7% better than the real consumprtion and the 530i is over 10% off.
The 545i consumption average was 17.6 mpg over ~ 4000 miles and the 530i get a (disappointing) 18.6 mpg.
The best highway mileage I had was 27.4 for the 545i and 30.2 for the 530i.

 

Your numbers are amazing. I can't even get close and boy, did I try for two tank fillings recently. In the city I simply cannot get above 20 mpg even with the A/C off, doing everything in 6th gear, coating as much as I can, etc.

 

It seems the V-8 6spd is not accurate. I had questioned this from the start and finally gave up.

I am off 5-6mpg. I drive 90% highway and 10% fun during my day and I averge 21-22mpg where my computer says 27-28mpg. On a trip I will get 25-26mpg (driving 80mph) and the computer will register 30-32mpg.

There is a calibration value that is supposed to help this. I had the dealer change it once but they made it worse so I just canned it. The info was a thread from a year ago or so. Here is the info:

Reseting mileage calculations

hold in reset button approx 30 seconds until information comes up,scroll thru
menu by pressing reset button to code 19(lock on)wait until new info is displayed
scroll again to code 21 wait until info comes up,go to code 20 push reset once this will start right hand digit scrolling hit reset when digit you want to select is displayed,2nd digit will now start scrolling,continue until all digits are set,you must then hold reset button until new code is displayed


The only thing that really bothers me is it effects the miles to empty when you start getting low.

I guess when you spend this much money on the car, I would think the mpg calculation should be +/- 1mpg.

So, if anybody gets this to work, let me know and I may try it again.

 

hmmmmm... interesting... mine (07 530i step) always around 17-20... 80% city driving, 20% highway

 

I took pics of my OBC on a recent trip. The trip was all highway and the MPG was reset as I departed.

 

They are good numbers but if I did all city like your saying you get 20mpg I would probably get less. I do have a light foot but if I play around and my foot gets heavy my numbers drop. Check out what BMW is coming out with in the very near future, I hope soon, Regenerative Braking and Stop and Stop System. They both should help to get better gas mileage.
cheers
vern