Same as a Range Rover, a Navigator is made to adjust height depending on speeds......for better handling ofcourse. Mine does the same thing, at 60-70mph it will sort of drop the height alittle bit! Now, if you a have a situation where it is loosing all the air to the extend of riding like a low rider, then you have a problem, it never goes that low! Unfortunately Ford made these vehicles to be repaired by ford alone expecially this kind a system.....you might need to see a dealer if this is what you have!
The EPA range estimate for the 2008 Lincoln Navigator is 336.0 mi. in the city, 504.0 mi. on the highway.
The EPA range estimate for the 2014 Lincoln Navigator is 392.0 mi. in the city, 560.0 mi. on the highway.
The EPA range estimate for the 2003 Lincoln Navigator is 308 mi. in the city, 420 mi. on the highway.
The EPA range estimate for the 2011 Lincoln Navigator is 392.0 mi. in the city, 560.0 mi. on the highway.
The EPA range estimate for the 2001 Lincoln Navigator is 330 mi. in the city, 450 mi. on the highway.
The EPA range estimate for the 2002 Lincoln Navigator is 330 mi. in the city, 450 mi. on the highway.
The EPA range estimate for the 2010 Lincoln Navigator is 392.0 mi. in the city, 560.0 mi. on the highway.
The EPA range estimate for the 2012 Lincoln Navigator is 392.0 mi. in the city, 560.0 mi. on the highway.
The EPA range estimate for the 2005 Lincoln Navigator is 308.0 mi. in the city, 476.0 mi. on the highway.
The EPA range estimate for the 2007 Lincoln Navigator is 336.0 mi. in the city, 476.0 mi. on the highway.
The EPA range estimate for the 2009 Lincoln Navigator is 392.0 mi. in the city, 560.0 mi. on the highway.
The EPA range estimate for the 2004 Lincoln Navigator is 308 mi. in the city, 448 mi. on the highway.