In the fall/winter of 2016/17, FPInnovations conducted a long-term study to quantify the fuel consumption and calculate the energy intensity of two feller-bunchers, and to compare the results with a typical short-term benchmark study. Fuel data from an electronic computer module were recorded by an FPDat for
4 months. The fuel-consumption data were tested against operational conditions, such as stem size and slope, to see whether trends could be identified. The heterogeneity of the forest and terrain conditions contributed to the difficulty of identifying a significant trend.