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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 07-20-2005, 06:50 PM   #1 (permalink)
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While running some errands today, I checked to see how many miles I had left on 1/4 tank. Showed about 98 miles and since I was only going to be driving 5-6 miles, thought "no problem". Within 15 minutes and only 4 miles driven in stop & go traffic I was shocked to see I was down to 73 miles remaining and the mileage was decreasing every 2-3 seconds as I drove.(68 miles now) I thought I must be leaking fuel, but when I checked, that wasn't the case....whew! When I started to drive again the miles started adding up again until I was back up to 93 miles in reserve!!! WHAT? I decided to get some gas to be on the safe side and when I drove away from the station........I started losing miles again, FAST! Anyone have any ideas what that's all about???? Thanks
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Old 07-20-2005, 07:25 PM   #2 (permalink)
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That's weird. I know on my OLD e34 OBC it shows my miles left on the tank but doesnt fluctuate much. MAYBE in the e46/e90 (whichever you have), it depends on acceleration and gives you the estimated miles at the given rpm/speed you are running at. Is this the first time you paid attention to it?
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Old 07-20-2005, 09:06 PM   #3 (permalink)
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Bear is an unknown quantity at this point
A bad fuel sending unit (in the tank) will do what you are seeing.
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Old 08-10-2005, 08:24 PM   #4 (permalink)
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This is made to change. in stop and go it will go down in mileage when on the highway it will go back up. it takes a calculation of the fuel level and your driving habbits. ( meening that if someone drives with the accelerator pedal on the floor they won't get as much miles out of a tank as someone that light throttles the vehicle) As for the reserve message I'm not sure about that one.
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