When the car is loaded, more energy is needed to propel it. A loaded car feels sluggish so you have to press the gas pedal more, so more fuel is used.
Its answer is very simple that a car uses more petrol when it has to overcome more wind resistance.
It uses more petrol because of air resistance. Friction pulling the load on the roof which causes the car to use more petrol because of the weight it needs more energy to move around.
Petrol
Abnormally cold air is harder to generate. It is said that a car will use more petrol and/or water to do this. So yes, using cold air blowers will use a little bit more water and/or petrol
how much petrol will a car use (enginne two liters)
Because the petrol is the best combustible
The petrol will combustion will be bigger, thus there is more horsepower and the car will go faster.
The same on a car equipped with manual transmission. On an automatic equipped car it will use less idling.
Petrol
I thought gasoline and petrol were the same thing.
The simple answer is, it'll gum up the works. Gasoline/petrol is a thinner and more refined fuel whereas diesel is thicker and not as refined.
12 hours at 90mph