This week passed 11 years of Prius ownership. Mileage avg: 54.0 mpg over 124,403 miles. Gas $ saved vs a 25 mpg car: $7,261. Total maint cost only $2,646. All the data and charts are here: Prius Data
Outstanding. Our 11th birthday is next month I think. Getting hard to remember Our experiences are remarkably similar, even down to paying for alignment in 2004. My maintenance+repairs over ~ 170k miles was under one penny a mile. Most of the difference was good fortune with Michelin paying for most of a new set of tyres, and my not paying for rotations. Rotations are really easy to DIY, or Costco at least includes lifetime rotations in the tyre price.
Good gas savings I guess that's about $3/gal average cost. So if we say hybrid premium say ~$4000, you are ahead but we have to worry a little about HV Batt life. Not much worry though, Toyota probably helping you on any batt replacement since you got a whole fleet of em!