Purchased the Hybrid almost 1 yr ago. To date 26,000 miles and it runs fantastic. As for mileage, last summer I was averaging around 50 mpg since I do all highway driving. When winter came it dropped off about 5 mpg. Still beats my pickup truck I traded in. The navigation was my wife's idea and I am so glad she talked me into it. This is the greatest nav I have ever used. Had several hand helds and a Lexus. The only problem I have found is the tires. I have just replaced the stock tires since they were shot at 25000 miles. When I replaced them the tire guy told me I would lose about 2-3 mpg and he was right. I recommend buying hybrid tires.
Navigation, handling and comfort including rear seating comfort. XM is a nice touch also. Mpg makes the purchase price tolerable.