Hopefully, it's the Duratorq diesel that they introduced back in 02 for the Ford Transit (van).
The Argentinian Rangers use the older Power Stroke 2.8 made by International
It's a great engine. The only specs I could find indicate a 10 Km/l mileage, which I guesstimate at around 22-23 mpg.
The Duratorq on the the other hand, kicks butt in terms of mileage.
taken from this article: http://www.automotivetimes.com/pr/ford93002.html
Ford has now introduced a Duratorq TDCi 2.0-litre turbodiesel engine into the diverse Transit powertrain range. The 125 PS (123 bhp/93 kW) engine offers commercial vehicle customers increased torque, higher power, greater refinement and lower fuel consumption - the multiple benefits of high-pressure common-rail technology.
The new Duratorq TDCi 2.0-litre engine delivers peak torque of 285 Nm (208 lb ft). Its variable nozzle turbocharger provides robust low- and mid-range torque levels that give the new Transit TDCi excellent responsiveness and in-gear acceleration. Its pulling power is calibrated especially for the needs of Transit commercial vans and chassis-cabs as well as drivers of the new Ford Tourneo minibus.
Its fuel economy is impressive. According to homologation data for 1,700-kilogram inertia weight class models, Transit TDCi fuel consumption levels are certified, in litres per 100 kilometres, at 8.8 (32 mpg) urban, 6.2 (45.5 mpg) extra urban and 7.2 (39 mpg) combined in the new European driving cycle. This gives Transit TDCi models in this class an effective range of 1,100 kilometres (680 miles) between fill-ups of its standard, 80-litre fuel tank.