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The amount of energy will vary depending on the quality of the petrol but a good estimate is 32MJ per litre. So that's 32kJ in 1ml.
A gallon of gasoline contains about 132x106 joules of energy, which is equivalent to 125,000 BTU or 36,650 watt-hours:
If by petrol you mean gasoline, the Wikipedia lists an energy content of 46.7 MJ/kg. To get the value per liter, you need to multiply that by the density of gasoline, which is in the range of 0.71-0.77 kg/liter.
1 litre diesel in joules
The cost of petrol is irrelevant to the number of litres in a gallon which is approximately 4.5. Therefore the cost of a gallon of petrol at 90p per litre is £3.60. Furthermore if petrol costs 90p per litre you should fill the tank and a couple of jerry cans, not just buy a litre!
50.75 joules of energy equates to about 12.1 calories.
About 670 joules.
If you know how many km's you can travel per each litre of petrol, you can divide 580km's by km's per litre and then multiply by 2.50.
39.2 joules of potential energy.
0.735 kilograms/litre
there are 100 joules in an energy efficient light bulb 75 joules go towards the light and 25 joules go towards the heat
1 Litre of liquid - 1 Kilo :] x