New prius owner.. how am I doing on Mileage!!

I just purchased a certified pre-owned 2007 Prius 5 days ago. I am halfway through my first full tank and am averaging about 51 mpg. This is all freeway. 3 of the days with a 100 lbs of bowling balls in the back. With the AC on medium to low almost all the time.
About 80 miles I didn't want to play all the prius speed/foot position games and just drove..

haven't done anything with the tire pressure either.

51 MPG according to the computer.. good? bad?

 

I'm just going to "drive!" on the next tank and see what the difference is..
after that I might try the faster acceleration to coasting speed and see how that works..
thanks for the info

 

thanks.. and this is almost all highway 65 plus speed.. only about 5 x 6 miles a day in the city..
check this out though. still on my first tank .. about 400 miles in.. and at 51.4 mpg on the MFD(i think it is called)
on my way home and on my way to deal with the dealership so I'm not is a very good mood and don't feel like playing any prius acceleration/feathering games. I just drvve 70+ all the way home...I didn't ever punch it .. never went past 1/4 throttle really (i think.. have never opened it up at all...) my average mileage on the mfg went all the way up to to 51.9.. I gained .5 mpg average with that many miles on the trip odometer already.. that means I was clocking some pretty high mpg to get the average to move that much..
so now I don't know what it better.. play the game or just drive.. I had to fill up at 451 miles and put 9 gallons in.. so that is showing 50.1 mpg and the mfd 51.9.. It seems with the bladder fuel tank the mfd is more accurate.. I am going to hook up my scanguage this weekend for another source of data..