Averagefuel consumption of Alfa Romeo 159. On Car A Rac you will find the specific engine fuel economy of vehicles. Find out fuel efficiency of your car. 1.9 JTDM Diesel 29.8 mpg(USA) 7.9 l/100 km 48 mpg(USA) 4.9 AlfaRomeo 159 2008 1.9 JTDm 16v fuel consumption is 7.1 litres per 100km in combined city/highway mode (14.1 km/l), city fuel economy - 9.9 l/100km, fuel consumption on highway - 5.5 l/100km. Fuel tank capacity is 70 litres or 18.49 gallons , which gives a mileage up to 980 kilometers without refueling in urban cycle and even up to 1260 AlfaRomeo 159 2.4 JTDm Fuel Consumption (Economy), Emissions and Range. Fuel Consumption - Economy - Combined: 35 MPG 6.8 L/100 km 42 MPG UK: How many horsepower (hp) does a 2005 Alfa Romeo 159 2.4 JTDm have? The 2005 Alfa Romeo 159 2.4 JTDm has 200 PS / 197 bhp / 147 kW. Ifi was buying a 159 for private use i would have a Ti spec 210 2.4 JTDM and not worry about the not so great fuel economy. If it was going to be a company car I would have to buy the 2.0JTDM as the co2 figures on the 2.4 means a Hi3DE.