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This study compared power take-off (pto) power performance, fuel efficiency, and NOX emissions of a 23.9-kW compact utility tractor fueled with No. 2 petroleum diesel (D2), a 20% biodiesel blend (B20), and neat biodiesel (B100) under two load conditions. Three steady-state (1h) tests were conducted with each fuel at both rated pto speed (540 rpm) and at peak torque (18 total tests). At rated pto speed, there were significant (p < 0.05) differences between the fuels for pto torque and power (D2 > B20 > B100) and pto-specific fuel consumption (D2 = B20 < B100); there were no significant differences for pto-specific NOX emissions, although specific NOX emissions trended higher as the biodiesel content of the fuel increased. At peak torque, there were significant differences (p < 0.05) between B100 and the other two fuels for pto torque and power (D2=B20>B100) and for pto-specific fuel consumption, thermal efficiency, and NOX emissions (D2=B20 (Download PDF)    (Export to EndNotes)