Granted I have a dirty IAC or something (still trying to figure it out)...
But I get closer to 12-13 and I am sure I am not the only one on here who sees mileage like that.
I also have a 5speed but I drive like a total nut job.
That having been said I highly recommend the 3rd Gen! You will never look back, I have many friends with 4runners ranging from the 1st gen to the 5th, my 4runner inspired all of them to follow suit and they all agree that it is the best, its a perfect balance of minimum creature comfort and functionality with neither being compromised.
If you havent already seen the top gear "Prius vs. M5" you should check it out it shows very clearly that the manner in which a car is driven makes all the difference.