6.9kms/liter
Diesel engines are more efficient than gasoline because chambers are different. A diesel engine has better gas mileage.
About Four Gallons give or take. buy two to three gallons of coolant and mix with distilled water for a 50 50 mix for best results. also it is best to go by a ford dealer and buy 48oz of VC-8 cooling system additive for the diesel engine's. VC-8 is a SCA/DCA additive to prevent cylinder cavitation.