I think I tend to agree with the fact that the Nav is generally a pretty lousy system. I have only had good data from it three times when using it dozens of times. On the way to New Hampshire it tried to put me on the road to Vermont. On the way to Florida, just outside of DC it told me to turn directly east, I looked it up later and it would have made no sense. Coming back thru DC to RI it tried to send me downtown instead of staying on the beltway. This doesn't even mention all the streets it does not have any info on. It is quite surprising that Toyota is peddling such a piece of junk. Needless to say I don't trust it at all. I would never purchase it again if I had any Idea it was this bad.
Otherwise I must say I love the car, getting between 44 and 45 MPG consistantly since coming back to RI.