After delivering four fuel-filled installments in the Fast and Furious series, writer Chris Morgan appears to still have more in the tank. That’s a car joke, by the way.

Actor and star Vin Diesel broke the news this week via his Facebook fan page that Morgan’s idea for the future of the franchise includes two more installments. Calling it a saga, Diesel said that if “2009′s Fast and Furious was chapter one, what writer Chris Morgan just delivered is Chapter 2 and chapter 3.” Diesel went on:

I have never been submitted a two story saga from a studio before… it is very exciting, and shows a commitment level that is hard not to respond to.

Excited about the sexy locations the filming of this sag…a would take us… this novel like story, that has twists and unexpected turns that is authentic, truthful and challenging to the characters.

Diesel is right in the sense that it is rare to see such commitment from a studio, at least this far in advance. But consider this: the total production cost of all four Fast and Furious movies thus far was just under $200 million. The films have grossed almost a billion dollars at the worldwide box office. They are also notorious for doing big business in rentals and DVD sales. For Universal Pictures, another order of two shots of Diesel and Paul Walker driving fast in pursuit of money and women is just what the doctor ordered. In this recovering economy, you can never have too much of a sure thing.

More on this story as it develops, and as the studio confirms or denies.