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Hooo that sounds like a pumping error on the pump meter.
The average FE for the trip is more accurate because it used the fuel used over the many miles driven so it can calculate to x.1mpg but the smallest unit of measurement of the rate of fuel that you are using is 0.1gph at 25mph = 250mpg which when used to calculate the instant MPG turns out to be not very accurate i.e. if you are really bunring 0.11gph at 25mph = 227.27mpg then it would calculate more accurately but apparently it doesn't have that precision.
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smartzuuk 
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