Is there a way to speed up the process in Mafia Wars on Facebook?

I am totally addicted to Mafia Wars, but I am finding out that it is taking a long time to make any significant progress in the game. The thing that’s slowing me down the most is that my energy only gets upgraded by 1 every 3 minutes, since I am doing the more advanced jobs. Some jobs require 60 energy every time I do them. Is there a way to speed up the energy process? If not, what minimum total energy amount do I need to get to in order for me to constantly be doing those high end jobs in New York and for my energy to be constantly replenishing itself every time I reach a new level?