We just traded in our 2005 Prius with 184,000 miles...the car was perfect and with no problems. We now have purchased a Plug in. On the 2005 we averaged 42-44 MPG. To get to our house, you drive up a five mile road where you gain about 1500 ft in elevation. That said, we are milking the downhill road in EV and going back up in ECO...on the first tank of gas, we averaged 55 MPG...second tank we are averaging 65 MPG with about 200 Miles so far on the tank. We are finding that we leave the house with a 13 Mile EV range and get to the bottom of the hill with close to the same (coming down the hill in "B)". On several trips, we have driven around town on EV, driven back to the hill, switched back to ECO, and had enough EV charge left to repeat the process...something like 25 miles of EV Interesting thing we are finding is that we are getting, the uphill does not seem to be having as much effect in drawing down the MPG as the old Prius. On the old one, we would see a 4-5 mpg drain with about the same miles on the tank...on the PIP we are seeing about 2. We love it!