The general rule for a diesel engine is that the higher the engine speed, the higher the consumption. After all, at moderate speeds the engine has more time for internal mixture formation, which is so typical for diesel engines: the engine therefore works more efficiently. For example, the turbodiesel engine of the Golf consumes, as a rule, about 6.9 liters per 100 km; in continuous "full throttle" mode, it consumes 2 liters more diesel fuel for every 100 km of travel. Therefore, it is desirable for the engine to operate at speeds equal to 50-70% of the maximum.
Thus, without fear of causing damage, you can adhere to the following driving method: accelerate, press the accelerator pedal not too timidly, but perhaps switch to the nearest higher gear early. If the desired speed is reached, switch to the highest possible gear and let the car move with a slight pressure on the accelerator pedal. It is advisable for the engine to work at high speeds only if the situation on the road requires it, for example, when overtaking or when driving in a column.
You can also save fuel by letting the car roll freely. When a certain speed is set and the accelerator pedal is released, the diesel engine receives the amount of fuel that corresponds to idling. But in this case, the free movement, due to the high braking effect of the diesel engine, is incomparably shorter than with neutral in the gearbox. The automatic gearbox also functions on this principle (control lever position "E").
For example, the gearshift lever can be set to neutral if you are stuck in a traffic jam, at a stop or on a slope. On the contrary, you should leave the gear engaged when going downhill, otherwise the brakes are under a lot of stress. Never press the clutch pedal with the gear engaged, always engage neutral, otherwise there is a danger to the clutch at low gears and higher speeds. Never turn off the engine if the car is coasting! After just a few braking attempts, the brake booster will fail.
At each long stop, you should turn off the engine, for example, before a barrier, before a traffic jam, before a traffic light. Even 5-7 seconds of waiting time can save fuel.
Formula E
To ensure continuous fuel savings, the already economical diesel "Golf" and "Jetta" models also feature the so-called Formula E equipment. External distinctive features: large front spoiler only for the "Golf" model or rear spoiler only for the "Jetta" model; there are also covers on the front windows and an inscription on the back. Along with the external features, there is also a gearshift indicator and a slightly modified 4-speed gearbox.
The original article is available on the website (VWmanual.ru)
But according to Volkswagen's test results, the engine is less loaded at low revs and high load than at high revs and partial load. To do this, the electronic control unit processes the information about the revs and the angle of rotation of the high-pressure fuel pump lever. If the engine load is not economically feasible, a signal is given for the appropriate shift. Driving with the shift indicator does not necessarily mean that high revs must be avoided. During "sporty" acceleration with full throttle and when squeezing out maximum speeds, the shift indicator does not flash, because the desired high acceleration does not allow an early upshift. Only when the next higher gear gives the same driving speed does the signal immediately appear that it is possible to shift.
The indicator panel remains dark when driving downhill with the accelerator pedal released or in the highest gear E.
The so-called 3+E gearbox is not designed for strong acceleration, driving in the mountains and at maximum speed. It is designed for favorable conditions that promote economical fuel consumption, i.e. if the vehicle is driven at medium and high speeds. In this gearbox, the gear ratio of the 3rd gear corresponds to the 4th gear of a conventional 4-speed gearbox. This is the so-called direct gear. Gear E is designed for lower engine speeds and lower fuel consumption.
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