What type of gas does a 2004 Lincoln Navigator use?

The 2004 Lincoln Navigator features A5.4 liteR8-cylinder engine that provideS300 HP and holds up to 28 gallons of gas. It uses premium unleaded fuel with an octane of 97 or higher. While other vehicles can run on regular unleaded gas with an octane of 87, the difference lies in how a car's engine is designed and whether higher octane levels are needed for proper firing. In general, expensive cars use more compression in their combustion chambers and need premium gas. They are also often turbocharged. For its size and class, the Navigator performs as expected, offering a combined mpg of 13-14; 11-13 miles per gallon in the city and 16-17 miles per gallon on the highway.