There isn't a ton of wiggle room with the Prius. It already automates many hypermiler functions (EOC, driving at high engine load), and those it doesn't (driving without brakes) it negates with things like regenerative braking. Therefore its a lot harder to get massively higher MPG than the EPA rates it for. Thats kind of the beauty of the Prius. You don't have to try to get great mileage out of it. Sure, I can probably get 50-60 mpg in my 2004 Civic, but I can almost not think and get 50 mpg out of my 2004 Prius. Just set the cruise and let the Prius do the hypermiling for you. Granted, you can put the extra effort in and eek out another 10 mpg. But, with the car itself, you're most of the way there just by owning it.
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