Fossil fuels give the most energy per volume, and is relatively easy to produce. We've built an entire infrastructure on this fuel. Wanting or needing to develop another fuel of equal or greater yeald has nothing to do with whether it's chemically or physically possible.
I don't think alternative fuels can replace fossil fuels 100%. Even a 50% replacement will be difficult, like going back to dial-up internet access after you've been using broadband for years.
*Starman
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