The prices would definitely range from 50$-90$ because it greatly depends on the quantity your tank can intake, the amount of gas the car uses and many other factors. Thus, it is impossible to be precise.
From Cardiff to Glasgow is some 400 miles and would cost about £75 in petrol.
Nothing, airplanes don't use petrol.
A full tank of petrol is worth as much as a full tank of petrol in any other car.
150
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.
300 dollars
It would cost (2.4) times (the cost of one gallon petrol). Also, add cost of tolls, food, etc.
Petrol cost Rs 7.60 per litre in India.
1 litre of petrol
Twice as much as it would take to get half way there ;-)
It depends if you are using diesel or petrol. Diesel is more expensive so it would cost more.
£1.20 ish