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We've talked about this on this forum many times. The most basic problem, among many other factors, is that you cannot determine your real fuel mileage from a single trip simply because of variability when you initially filled your tank and then refilled it to measure the fuel used.
It's particularly hard to consistently fill your tank to the exact same level each time. You certainly cannot rely on the automatic stop on the gas nozzle.
And all it takes is a little variation to skew your mileage one way or another over a 270 mile trip.
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