SE Michigan Prius Owners We are considering setting up a Detroit area shop to offer installation the Hymotion plug-in system in Toyota Prius's. This kit turns your Prius into a plug-in hybrid, extending the electric driving range and improving fuel mileage dramatically. The systems are very popular in the Western US where the Prius is much more prevalent. The system cost is approximately $12,000 per vehicle. I am curious if local owners have an interest in this retrofit. Stu stuartciriwn at yahoo dot com