Quote:
Originally Posted by oil pan 4
A btu per mile comparison propane gives about a 3% fuel economy advantage over gasoline, likely because it's pure vapor.
|
Or likely because the fact that propane only has 80% of the energy content of gasoline, requiring the engine throttle to be opened significantly more on a propane engine, in order to do the same work as an equivalent gasoline engine. This would have the side effect of lowering engine vacuum (and increasing fuel economy as a result).