The Isuzu KB250 typically achieves a combined fuel consumption of 7.9 litres/100km (12.6 km/l) under standard test conditions[1][7]. However, many owners report real-world averages slightly lower, around 9 km/l, depending on their driving style, load, and maintenance condition[1]. For certain more recent models and with predominantly highway driving, users have reported consumption figures as high as 13.3 km/l under ideal conditions[3].
The KB250 features a 2.5-litre turbo-diesel engine, and as a workhorse, its consumption may vary significantly when towing, fully loaded, or in heavy city traffic[5]. Regular servicing—such as having the injectors checked and using clean diesel—can help maintain optimal fuel efficiency[1].