At 15 miles per gallon, 7 gallons of petrol.
It depends on the cost of said petrol and the efficiency of the vehicle in "miles per unit of petrol". You didn't supply enough information.
From Cardiff to Glasgow is some 400 miles and would cost about £75 in petrol.
Depending on driving conditions - about 2.5 gallons.
It would cost (2.4) times (the cost of one gallon petrol). Also, add cost of tolls, food, etc.
None, if you cycle! If you drive, it depends on the fuel efficiency of your vehicle and your driving style.
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The amount of petrol needed to travel for one hour depends on the vehicle's fuel efficiency and speed. For instance, if a car travels at 60 miles per hour and has a fuel efficiency of 30 miles per gallon, it would consume about 2 gallons of petrol in one hour. Therefore, the specific amount of petrol required varies based on the vehicle's performance and the driving conditions.
500 miles is always 500 miles unless it's nautiical miles. I'm not sure if 500 miles in petrol would be classed as nautical miles.
Depends on the fuel mileage that the vehicle you are driving gets and the price of fuel along the way.
That is totally dependent on the price for the petrol and and the miles per gallon rating on the vehicle.
200 litres
depends how much petrol is in the tank