RAM 1500 EcoDiesel V6 The most efficient RAM truck configuration is the rear drive 

 RAM 1500 EcoDiesel V6. The 3-liter diesel engine delivers 32 miles per gallon of fuel economy.

.Whats wrong with Ram 1500? Common Dodge RAM 1500 Problems Multi-Volt Muffler Fault - Models 

with 3.7L V6 and 4.7L V8 Engines Multi-Engine Bolts 

 for Exhaust Gas Damage. ... Coolant

 Leakage - Dodge Ram 1500 owners complained

about hot water slings due

 to 1994-2010 coolant leaks.