I drove a few 2008 prius'. I decided on the red standard package 6. I thought the touring was uncomfortable, and harder to handle. Wider tires will bring mpg down, but not much. with the standard tires the car rides smoother and sits higher.
I have leather seats and still sit on a lumbar seat. (bad back.)The dealer I bought from is running more standards through. Don't over think this. My wife and I both preferred the "standard" after hours of driving both models.