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Well, what did the scangauge say for this second tank?
It's conceivable that the first fill was an "overfill" and the second one was a correct fill or even an "underfill," which could throw off all kinds of numbers. Of course, if your scangauge value for the second tank was around 44-45mpg, then that seems less likely.
Further, I would guess that you did not in fact drive with no hypermiling techniques...even if you drove faster (and 60mph isn't really that fast in the scheme of things) and accelerated harder. You probably weren't on the gas and brakes all the time; you probably coasted a lot...that sort of thing.
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