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A 2nd gen Prius should do 60 mpg at 60 mph without trying.
The thing about the Prius in the cold is the warm up. With mine the MPG display would show 25 mpg for the first 5 minute interval and then jump back up to regular mileage. If you are jumping on the highway and driving miles that isn't that much of a difference but if you are doing a bunch of short trips around town it can be a big hit (just like with any gas car). A block heater and grill block can help a lot with that .
I'm partial to the Prius. I've had two and they were rock solid cars. Some of the lowest cost cars I've ever owned and it is a large and roomy car that is very practical. Buy it, drive it, and expect to get 50+ mpg without doing anything.
If you want a ecomodder project to play with it likely isn't the best option because they are so good as they come.
If you want a project you can do a bunch of mods to a Civic and get the same mileage as a stock or lightly modified Prius. Is the goal to save money or try to see how much you can beat the factory MPG rating?
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