Comparative environmental behavior of bus engine operating on blends of diesel fuel with four straight vegetable oils of Greek origin: Sunflower, cottonseed, corn and olive

► Study of environmental behavior of bus diesel engine with four vegetable oils. ► Comparison against the neat diesel fuel case. ► Reduction of smoke and slight increase of NOx with vegetable oil blends. ► Very slight increase of emitted CO and HC with vegetable oil blends. ► Effectively the same brake thermal efficiency with vegetable oil blends.