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petrol, or petroleum by-products, are chemical chains of carbon and hydrogen. For this reason, they are all called hydrocarbons.So, yes, you CAN build petrol from hydrogen and carbon, however, it takes energy to do so. Burning hydrogen directly, in combination with atmospheric oxygen, derives plenty of energy without going through the extra steps, waste, and expense to make more complex molecules.The real problem with hydrogen is the difficulty of storing it. The molecules are so small and slippery, they tend to leak out any container you put it in. And making it dense enough to make carrying it portable for long trips is a further complication.