I'm sure you have done well, but 93mpg sounds too good. A 'quirk' of the gen2 Prius is that there is a fuel bladder in the tank. It's there to control passive emissions and get the car its AT-PZEV rating. But because it is a stretchy material subject to differences in temperature, it makes the car one of the most variable on amount per fill up. You probably got a short fill this time
I don't mean to bring you down, but prep you for when your average mpg from multiple tanks isn't has high.
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