Originally introduced in 1998, the full-size Navigator is like the grandfather of American luxury SUVs. Now in its fourth generation, it stands out from competitors by offering one of the best infotainment systems in the industry. Available in standard or extended-wheelbase configuration, the latter 5.63 metres long, the 2.7-ton Navigator relies on a twin-turbocharged 3.5-litre V6 rated at 440 horsepower. Naturally, fuel economy is not one of the reasons to buy this mastodon.