Even single trip (one way) fuel mileage can be misleading. There are places I get 20-30mpg to get there and 99mpg (according to the MPG on the dash) to get back.
The hybrid system also messes up the facts since you almost always start out with a different state of charge than when your finish driving.
If you could spend a day doing the same trip over and over again and average out the total then you'd get a better idea of what the real fuel mileage is.
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