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10-13-2010, 08:51 AM | #1 |
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Hybrid M3?
99.9 mpg while cruising at 90 mph. Beat that gas mileage! I believe this was a computer glitch. I hadn't reset the overall MPG in 20K miles and it was at 18.6 and then for some reason it jumped to 99.9. I had to reset it to get it to start working again.
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10-13-2010, 10:35 AM | #3 |
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It happens because you are applying very little throttle while the car is travelling very fast. It takes it a bit to get enough sample data and come back down to reality. You could also probably duplicate this behavior by reseting it while coasting down a hill for example.
On a side note, 18.6 is a great average. Mine never goes above 17, though I do have a heavier, less fuel efficient E93. |
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10-13-2010, 10:42 AM | #4 | |
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Anyway even if it were instant mpg or I had just reset it I would have to be driving off a cliff, to be off the accelerator, to get 99.9 mpg at 90mph.
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10-13-2010, 10:59 AM | #5 | ||
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It is essentially instant MPG when you first reset it. It starts sampling gas used and distance travelled immediately. The sensors/software aren't perfect though, which can lead to the 99.9 situation upon reset. At least, that's how I recall it from messing with it in the past.
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You're right, it shouldn't register 99.9 as long as some gas is being used but as I say I've been able to get it to go to 99.9 in the past myself upon reset. Though I can't say I recall exactly what sort of situation will cause it. |
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10-14-2010, 10:42 AM | #7 |
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Quick, send this to the EPA so the government won't hit us with the gas guzzler tax again!
Today, I shall become ... ... a GENERAL!
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2017 F80 YMB.
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10-14-2010, 04:31 PM | #8 |
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Drives: 320i, 325xi, 335Xi, 335i, M3
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Garage List 2010 BMW 335i [0.00]
2011 BMW X335i [0.00] 2006 BMW E90 325xi [0.00] 2011 BMW E90 335xi [4.00] 2011 BMW M3 E90 [7.00] 2006 E90 320i [0.00] |
My poor M3 has never seen above 14mpg. Since the day i got it it only gets worse and worse. Im at 11.2 right now i think. god damnit
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