Updates are delivered over your home internet connection, cell phone internet or both, routed to Toyota's G-BOOK telematics system, and should be fresh enough to warn you of a closed road or newly opened lane.

ENGADGET: Toyota's "Map on Demand" a world's first

Another source of help: Publisher cch just put out a how-to book on the subject: Practical Guide to Cost Segregation, by Paul G.

FORBES: Depreciate It