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The short answer is always drive appropriate for local conditions, traffic, and hazards. If you're somewhere where you can get away with coasting a little faster to get some momentum for a long flat or an uphill stretch, then do it. Obviously if there's a speed trap at the bottom of the hills or a driveway with a short sight distance, use your better judgment. 104mpg is not typical, it's a record. While it's not uncommon for folks to get 50+ mpg out of their Prii and some can even get 65+ frequently, conditions always dictate results. As a general rule, the slower you go, the better your mileage, so speeding is not only not necessary, it's frequently a detriment to the best mileage possible.
I'm far from the most experienced P&G'er here, so I'll leave the details to the experts.
In the meantime, welcome aboard.
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