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Performance requirements and consumption

In the case of straight-line, uniform movement, the vehicle is affected by rolling resistance, air resistance, and the force of gravity on slopes and uphills. Let's examine the typically occurring cases. The LPG engine has a maximum output of 220 kW, the Diesel engine 310 kW. Green color is 0-220 kW, red color is 220-310 kW, black is the range above 310 kW (not achievable). The consumption was calculated on diesel for a truck with a very good consumption (210 g/kWh - at the wheel).

Driving on flat roads and uphills in no wind, with different total weights:

- The 3.7% gradient is the biggest gradient on the M0, M1 motorways.

  The big climbs can be viewed in detail on the                                


It looks like Mount Anna1.4 km long ascent with 40 tons the MAN approx.  At a speed of 62kmh, the LPG vehicle approx. It goes up at a speed of 45kmh(the waste of time  31 sec). for 24 tons, 86kmh and 68kmh (16 sec).

It is also clear how the fuel consumption depends on the speed on uphills: 40kmh-90kmh 100%-130% 

Progress son the same roadin wind, for different total weights:


The previous table clearly showed that the climbs require much more power, but only for a short time. The wind keeps blowing...


The wind speed, even a weak wind, means a 20% increase in consumption. In case of strong wind, the fuel consumption can increase to more than 300%.


Tailwind and wind shadow can significantly reduce consumption. Therefore, the road tests read in the media can be treated with due reservation, because they do not contain correct information about wind speed.

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