Assuming that your MFD is set to look at fuel consumption as you drive, in Canada the MFD switches to Litres/hour from km/h.
MFD stands for multi function display ? And yes, it's set to display the fuel consumption as I drive, it does show litres/hour when the car is not moving.
But when I drive, it shows litres/100km. I noticed that while being engage in a gear, when I'm braking and not giving gas, my fuel consumption is about 2l/100km, but before braking it was at 0l/100km. I don't give any gas, so why my fuel consumption goes from 0l/100km to 2l/100km just by applying the brake pedal ?
Sometimes it reach about 3.5l/100km while braking, I'm not looking for fuel economy, I'm just trying to understand why the engine have to use gas when applying the brake. The brake system is hydraulic, it doesn't need work from the engine, so it's not supposed to use fuel. I would understand the gas usage if I would be in neutral the engine would have to work to stay idle, but when I'm engage, the energy of the transmission should be enough to keep the engine running and to avoid using gas.
Is it because the engine have to keep the vacuum pump running since the brake booster depends of the vacuum produced by this pump ? What if I don't have a vacuum pump anymore ?
Thanks again for your help, just trying to figure out something useless...
