PDA

View Full Version : Calibrate computer MPG???


abqhudson
04-05-2005, 12:15 PM
I have a 2004 530i. The computer mpg is way off. Is there a way to recalibrate this? Local dealer says no. Need to confirm whether or not I am just stuck. Thanks for any information.

Jim

Ågent99
04-05-2005, 01:40 PM
Out of curiosity, how do you know it is way off? I assume you've reset it several times but to no avail?

abqhudson
04-05-2005, 03:16 PM
I bought the car in Louisville, KY and drove it back to Albuquerque, NM. I checked the mileage and reset the computer at every fill-up on the way home. The computer was consistently about 22% optimistic. Do you have an answer to my question?

Jim

Speedfreak
04-06-2005, 06:06 AM
I can't answer your question, but. I checked mine. It was always optimistic. After I had my dash pixals repaired my indicated MPG went way down. I'm not sure what that may have had to do with it, I haven't checked it since. I should get a chance in a couple of weeks.

philippek
04-07-2005, 06:04 PM
Your car is calculating mpg using imperial gallons, which are about 22% larger than U.S. gallons. The E60 can be reprogrammed to calculate mpg by U.S. gallons.

And I hope the deal was really good to justify all that driving...;)

BlackMagic
04-07-2005, 08:01 PM
Yes, the system can be recalibrated. I have done it as mine was about 1-2 mpg high. It is now dead accurate to the tenth of a mpg, consistently tank to tank and I check every tank. Just do a search and find the write up on how to get into the system. It is a bit tricky.

Ågent99
04-08-2005, 08:11 AM
Interesting. According to my trusty HP48SX:

1 galUK = 1.201 galUS

Great work from the fellow 'festers...gotta love this board sometimes.

:thumbup:

CheapCheap1
04-08-2005, 10:48 AM
Your car is calculating mpg using imperial gallons, which are about 22% larger than U.S. gallons. The E60 can be reprogrammed to calculate mpg by U.S. gallons.

And I hope the deal was really good to justify all that driving...;)
Is it too difficult to reprogram it to US-Gal?
And, how to do it?
Would you pls share w/ us...
Many thanks,
CC1

philippek
04-08-2005, 10:56 AM
Is it too difficult to reprogram it to US-Gal?
And, how to do it?
Would you pls share w/ us...
Many thanks,
CC1

If you have an earlier build (pre Feb 05), the dealership has to do it. If you have software 16.0 or greater, I believe it's under the "units" menu under "vehicle settings." I can't vouch for the later, as I don't have 16.0 yet.

iateyourcheese
04-08-2005, 11:24 AM
Your car is calculating mpg using imperial gallons, which are about 22% larger than U.S. gallons. The E60 can be reprogrammed to calculate mpg by U.S. gallons.

And I hope the deal was really good to justify all that driving...;)

Wow. At first I thought you were being sarcastic. Nice catch.

abqhudson
04-09-2005, 03:39 PM
Fantastic. You were exactly right and I was able to reset the units to US gal.

Thanks again for your help. I'm not sure why the "Master Certified Techs" do not know this.

Jim

cprgolds
04-23-2005, 07:56 PM
Is it too difficult to reprogram it to US-Gal?
And, how to do it?
Would you pls share w/ us...
Many thanks,
CC1

It's in the I-Drive Display Settings.....

netdoc
04-25-2005, 12:53 PM
I just bought a 05 530i. I know it will get better but I am only getting 16mpg on average city and hwy driving... I think it is way low. I have reset it when I refill to measure. The car now has 900 miles on it. I think I am way off....

Ågent99
04-25-2005, 01:12 PM
I was getting just under 20 mpg on my 545i during my wild 5 days/1250 miles in Europe.

Try using good old pencil and paper and see how it compares to the BMW computer.