The 2009 Volkswagen Touareg 2 TDI is a rarity in a world of gas-guzzling SUVs that aren't meant to ever leave the beaten path. The VW Touareg 2 TDI offers highly competent on-road driving dynamics with fuel efficiency rivaling that of a midsize sedan, and is an extremely capable off-roader. Part of the TDI's appeal lies in the fact that many of its parts are shared with the much more expensive Audi Q7 TDI and gas-powered Porsche Cayenne. For those willing to forgo the exclusivity of these nameplates, the Touareg 2 TDI represents an opportunity to enjoy a similar driving experience at a lower price point. Despite its luxuriously-appointed cabin, however, many buyers will find the Touareg 2 TDI's five-passenger design flawed in light of the current trend among SUVs to offer seating for seven, and if diesel prices begin to rise again, you may end up paying a premium at the pump.