“…In the road transport, the income derived from transportation services is affected by many factors. These include type, technical condition and reliability of the vehicles, the intensity of their use, transport fees, the state of the road infrastructure, the cost of consumables (fuel, oil, fluid engineering), personnel costs, the size of taxes and administrative fees [2,3,4,9,11,13,16,17,24,25,28,39]. It is commonly known that the properties and operational parameters of internal combustion engines change under working conditions [2,35].…”