Aerodynamic body parts | If the condition stated exists, the number of points after it should be entered in the negative or positive column depending on the sign. | |||
Fuel consumption | Points | Neg. | Pos. | |
Sun visor | +2 | +2 | ||
Cab side deflectors | - 4 | |||
Tractor side moulding | - 1 | - 1 | ||
Trailer / semi-trailer side moulding | - 3 | |||
Roof spoiler | - 6 | |||
Excessive clearance between semi-trailer and cab | +1 | +1 | ||
Tires | ||||
Tire inflation pressure too low | +3 | +3 | ||
Low-profile tires 60 / 70 / 80 % | - 2 | |||
Road tread instead of traction tread | - 2 | - 2 | ||
Retreaded tires | +6 | +6 | ||
Larger tread depth | +4 | +4 | ||
Twin tires of trailer and semi-trailer | +3 | +3 | ||
Tires with low rolling resistance | - 3 | |||
Drive train | ||||
Retarder | +2 | +2 | ||
Rear axle ratio not optimum | +2 | +2 | ||
Engine power not matched to operations | +4 | |||
Total: | - 3 | +23 | Add negative and positive points. | |
Balance: | +20 | Subtract all the negative points from the positive ones. If the result is negative, the vehicle is optimally equipped. | ||
Factor for calculating possible fuel saving | x 0.66 | The possible savings potential as a percentage can be calculated by multiplying with the factor 0.66. | ||
Result: | 13.2 % | The figure calculated provides information regarding the possibility of fuel savings as a percentage, or regarding the causes of high fuel consumption. | ||
Further factors | The factors listed below have a considerable impact on fuel consumption. As they are dependent on operations or environmental factors, however, they can be used only for assessing the complete vehicle in respect of the problem of high fuel consumption. | |||
Gross tractor-trailer weight / enhanced payload | +6 | |||
Winter operation / driving in rain | +9 | |||
Semi-artic instead of truck-trailer combination | -7 | |||
Road profile (moderate or severe motorway driving) | +9 |