Healthy diet. A healthy diet is one that helps to maintain or improve overall health. A healthy diet provides the body with essential nutrition: fluid, adequate essential amino acids from protein, essential fatty acids, vitamins, minerals, and adequate calories. The requirements for a healthy diet can be met from a variety of plant-based and animal-based foods.
The 2007 Chevy Tahoe has a gas tank capacity of 26.0 gallons. The 4.8 gets 15 mpg city and 20 mpg highway. The 5.3 gets 16 mpg highway and 21 mpg city.
The fuel tank capacity of the 1999 GMC Sierra 1500 is 26 gallons.  Its fuel economy is 13 miles per gallon in the city, and 16 miles  per gallon on the highway.   The consumerguideauto.howstuffworks.com (used car section) says 27 gallons, as does a 1993 Chevy Astro Van owner's manual (this class of vans are all the same).