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Old 09-10-2012, 04:31 PM   #265
Registered User
Join Date: Aug 2007
Location: Willamette Valley, Oregon
Posts: 1,525
My Ride: '00 328i ZSP w/ 217k
Originally Posted by MJLavelle View Post
My thoughts would be that your figures are coming from the gauge on the dash, which is nothing more than a vacuum operated (IIRC) guesstimate.
You need to do a real measurement by filling up, resetting your trip odo to zero miles, and driving. Then, top up your tank again, and divide the exact number of gallons you put in by the number of miles traveled.
Anything else, including the gauge or the instrument cluster computer, is just a guess, and not accurate.
There was a guy a few months ago making similar claims about milage, and it turned out he was just going by the gauge, and not really calculating the real number. He had several people freaking out, and a lot of others scratching their heads until I finally asked exactly how he was getting his numbers.
If you are correctly calculating your numbers, then they are extremely good, if not too good to be true.
If you are going by that silly gauge, then I can do one better. I hav seen more than 50mpg on my car for seconds at a time.
Yes, the numbers are coming from the car's computer, but still... they have never stayed that high in five years of owning it. This has been happening on a 25 mile stretch of I5 between Woodburn and Portland in both directions, four times now. I have driven this route hundreds of times and the mpgs have never stayed above 33 max. I guess none of you have any real answers for me.

Originally Posted by ///MPR77 View Post
I can get mine to say 99mph.
I can't remember if it displays triple digits, but I have done it.

And it will for those moments, be accurate.
No, it doesn't go into triple digits. Stops at 99.9. Easy to do, just reset while engine braking.

BMW - Suzuki - Jeep

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