Technically, Bio-fuels usually have a greater efficiency but a lower bsfc.
Economically, because of the low price of fossil fuels in middle east. Bio-fuels could be a good alternative for gasoline or diesel in Europe, not in countries such as Iran or Iraq.
However to reach a balance between these two different issues, its possible to make blends of fossil and bio fuels as an efficient alternative fuel.
The Iraq air is polluted highly by pollutants emitted from automobiles and trucks as well as power stations. The Iraqi gasoline and diesel are one of the worst fuels in the world. All reports demonstrated that the Iraqi gasoline contains high levels of sulfur (500ppm), as well as high levels of lead compounds to increase octane. The Iraqi diesel contains sulfur up to 1 to 2.5% of its weight which makes it the worst globally. In Iraq there are many alternative fuels that generate better engine performance and emit lower exhaust pollutants while improving fuel consumption such as biofuels