First let me say I love my prius.

Now let me ask why my 1993 Honda Civic SI which had about 135 HP was able to get MPGs of 36 to 41 but my new prius only gets about 48 to 52. I would imagine the prius could do much better then my old gas only car? Is it me or has the avg MPG of many cars gone way down over the last 10 years or so. We had a 2004 accord before getting the prius it average about 25MPG! Did emission rules change so bad that we hurt our overall MPGs or is everyone just power crazy so all our cars have to go fast?