I would like to express in the title of an article that I am developing a new (efficient) version of an equation, specifically John's equation, which I will use in the simulation of cars. I don't know which one of these titles sounds better in a scientific-technical context:

-An efficient form of John's equation for car simulation.

-An efficient variant of John's equation for car simulation.

-Efficient John's equation for car simulation.

Especially I would like to know if the last one is grammatically correct, cause joining an adjective and a possesive sounds a little weird to me.

Thank you in advance.

Regards,

Alfonso