Comparisons between energy sources need to consider cost per unit of energy and efficiency of conversion to useful service (light, heat, motion, etc).
Propane contains 24.75 kWh per gallon
Gasoline contains 33.41 kWh per gallon
So propane, with 27.6% less energy, would cost 27.6% less if all else was equal and we were really just buying the energy.
I don't know about the efficiency of gasoline vs propane, but would guess gasoline engines, being so widely used for so long, would be quite efficient. This needs to be known to determine which engine/fuel combo is more economical. It's the same comparison that can make a diesel vehicle cheaper to operate than gas even if diesel is more per gallon, because a gallon of diesel contains more energy than a gallon of gasoline and a diesel combustion engine is more efficient than a gasoline engine. Of course "how much more?" in each of those comparisons makes all the difference.
I don't know about the efficiency of gasoline vs propane, but would guess gasoline engines, being so widely used for so long, would be quite efficient. This needs to be known to determine which engine/fuel combo is more economical. It's the same comparison that can make a diesel vehicle cheaper to operate than gas even if diesel is more per gallon, because a gallon of diesel contains more energy than a gallon of gasoline and a diesel combustion engine is more efficient than a gasoline engine. Of course "how much more?" in each of those comparisons makes all the difference.
Damon
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