How does cost per seat-mile differ between commercial and private jets? I was reading an article the other day that mentioned many smaller private jets are more efficient, faster, can climb quicker and land with less space than larger commercial aircraft. Some of the obvious metrics make sense such as shorter landing distances, but the efficiency peaked my curiosity.

I am basically asking what is the cost difference or cost per seat mile difference in say a a Boeing 737 vs a smaller often private jet, say an Embraer Legacy 600 or similar with its maximum seat capacity setup.
I did some basic math to figure it out in terms of current gas prices.  I got that a private jet is about 6x more expensive.  Keep in mind it is probably more in reality because these jets aren't being used as much as an airliner so the rental price will be higher as well as the fuel.  But like I said, this was just an estimate based on current fuel prices and performance of an airliner vs a private jet, to give you an idea of the cost difference.