Very nice work, considering prices right now.
On 2/15/12, Damon Lane <damon.andrew.lane@gmail.com> wrote:
> 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.
>
> Damon
>
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