According to Dodge.com, the fuel tank on a 5.7-liter Dodge Durango is 24.6 gallons. The 5.7-liter comes standard with a V8 Hemi engine. City miles per gallon range between 13 and 18.
The 5.7-liter has a towing capacity of 7,400 pounds and can fit up to seven passengers. Durango engines come in two size options, 5.7 liter and 3.6 liter. The fuel tank capacity in both engine sizes is the same. In 2008 Dodge attempted a hybrid version of the Durango which was discontinued that same year. The engines in the hybrids were also to be 5.7-liter Hemis. The hybrids were to get much better gas mileage than the traditional Durangos, but the overall cost outweighed the advantages.