How much will a gallon of gas cost in 2050?

Specifically, in the year 2050, propane's energy content is recorded at 28.03 MJ/kg, whereas motor gasoline boasts a higher figure of 330.59 MJ/kg. This discrepancy indicates that per unit mass, motor gasoline contains significantly more energy than propane.

Propane and motor gasoline are two distinct fuels with varying characteristics. In terms of their energy content, propane exhibits a lower calorific value compared to motor gasoline, as evidenced by the data presented.

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Moving towards earlier years, the trend remains consistent. In 2040, the energy content of propane is 28.06 MJ/kg, slightly increased from 2050, while motor gasoline's stands at 29.81 MJ/kg, still significantly higher.

By 2030, both fuels see a decrease in their energy content. Propane registers 26.68 MJ/kg, and motor gasoline drops to 27.95 MJ/kg. This suggests that while the gap between their energy densities narrows, motor gasoline maintains its superiority.