The following sentence contains faulty parallel structure:

Proper tire pressure will not only improve gas mileage it will provide better traction on slippery roads.

Which revision corrects the structure?


Proper tire pressure will not only improve gas mileage, also it will provide better traction on slippery roads.


Proper tire pressure will improve gas mileage, proper tire pressure will provide better traction on slippery roads.


Proper tire pressure will not only improve gas mileage, but it will also provide better traction on slippery roads.


Proper tire pressure will not only improve gas mileage, and it will provide better traction on slippery roads.