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Old 02-01-2011, 07:15 AM   #11
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Re: Accuracy of MPG displays?

On our volvo the the MPG display is consistently 1mpg pessimistic from the actual mileage. If the car got 30mpg and the display will show 29 average. I think its because its constantly integrating the last few seconds for an average. So if you go into overrun and the injectors are OFF, the display will take about 5 seconds to go from whatever your load MPG was to 99.9.

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