The FR-S is my Prius. I average over 30MPG nearly every tank. Of course, my "other" car is a 2004 Suburban Z71, the ultimate anti-Prius, so I'm not sure I'm a good judge.
Like @
DarkSunrise said, my DD has to excite me. I spend an average of 2.5 hours a day in my car, it will not be boring. I had this discussion with folks at work the other day all talking about they have these boring "commuter cars" and then a more exciting weekend car. Where's the fun in that?
On second thought, I might own a Prius but only if I pulled out the politically correct drivetrain and stuffed a small block V8 in it. Then, I'd rebadge it to something like "Prius SST" and have a little stop light fun.