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12-30-2023, 12:07 PM | #1 |
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HELP - Innacurate MPH and terrible MPG
Just bought a 2007 3.0si coupe with 51,000 miles and have put 50 miles on it so far. For some reason, my digital speedometer readout says I'm going 12.8 mph at a standstill. Anyone have any suggestions as to why that is?
I am also getting around 14 mpg from driving around the countryside in 50F weather. My battery voltages are 12.0V with engine off and 14.5V with engine on. I also checked my intake filter and it looked good. Im new to engines so any suggestions would be greatly appreciated. I also haven't pushed this car hard yet, so I shouldn't be getting this low of mpg. From my understanding, people are getting 20+ mpg without trying. Best, New member of the Z4 community |
12-30-2023, 12:36 PM | #2 |
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That readout is your average speed not current speed.
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racingspice4.50 |
12-30-2023, 02:16 PM | #4 |
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Press and hold the button on the signaling stalk while the average miles per hour is being displayed
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bob'smerlot10.50 |
12-30-2023, 03:09 PM | #5 |
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The many mysteries of the E85/86 and their answers are revealed here:
https://cdn.dealereprocess.org/cdn/s...mw/2007-z4.pdf |
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pungo883.00 |
12-30-2023, 05:05 PM | #7 |
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How are you measuring your mpg? Through the same gauge? If so, that's the average mpg since the last reset and you may want to reset it and monitor again.
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01-01-2024, 05:34 PM | #8 | |
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Quote:
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01-27-2024, 04:06 PM | #10 |
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About 16.5k!
Also a quick update. After putting 300 miles on the car, I'm now getting about 25 mpg combined. I think the battery was just low so the alternator was constantly on. Thanks everyone for the tips |
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