2023-08-18 11:29:32
How about slowing down to save fuel? With prices fluctuating and running high, it’s worth it in the long run. We have calculated the gains according to your speed if you drive an average of 1,000 km per month on the motorway. Photo News By the editorial staff Published on 08/18/2023 at 11:06
Gregory, a reader from Charleroi, drives at 90-100 km/h instead of 120 on the highway. “With a full tank, I can do up to 1,000 km instead of 750 previously,” he says, very satisfied with the savings he makes at the pump. But how much can you earn exactly by driving slower? We asked the Vias Institute, which provides eco-driving training, to calculate consumption at different speeds for an average of 1,000 km per month on the motorway (50 km traveled per working day).
As our infographic shows, a driver driving at 90 km/h consumes on average 8 liters less than at 120 km/h per 1,000 km. Building on the tolerance margin of radars, many motorists stall at 130 km/h. Besides the fact that they risk being fined, this behavior costs them 3 liters more than if they were at 120, or just over 6 euros at the current price of petrol and diesel. These amounts may seem small. But on the scale of a year, the follower of 90 km / h on the highway will pay up to 264 euros less than the hurry at 130 km / h.
“These figures were calculated with an average car. Depending on the model used, we may save a little more or a little less,” says Benoît Godart, spokesperson for the Vias Institute. On the other hand, what does not vary from one user to another is the time lost or gained depending on the speed. At 90, we will have accumulated more than 3 hours of delay compared to 130 km/h on the scale of a month.
“Driving at 90 km/h is not ideal because we move at the same speed as the trucks. It’s better to be at least 100 km/h”, advises our interlocutor. But for him, it is useless to stick to this average if we multiply the accelerations and untimely braking, very energy-consuming. “Similarly, we consume more with poorly inflated tires,” he says.
The Reservoir Rumor
And the rumor that you consume less with a full tank? “You can find everything on the internet on the subject. It may have been valid before because of the evaporation of gasoline. But today the reservoirs are sealed. You can hear it when you click to close. In any case, the economy would be non-existent in the event of detours of a few kilometers to get to the service station”, comments Benoît Godart.
On the other hand, he advises against driving on the reserve. The pump must work harder to get the last liters of fuel. “In addition, there may be contaminants at the bottom of the tank that could affect vehicle performance,” warns the road safety specialist. And having a permanently half-full tank doesn’t really matter either. The car weighs a few tens of kilos less… out of a total mass of 1.5 tonnes.
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