What is the best gas type for a Nissan Versa, particularly a 2012 SV model? ?

According to the owners manual:
"Use unleaded regular gasoline with an octane
rating of at least 87 AKI (Anti-Knock Index) number (Research octane number 91)."
Also from the owners manual:
"Do not use E-85 fuel in your vehicle.
Your vehicle is not designed to run on
E-85 fuel. Using E-85 fuel can damage
the fuel system components and is not
covered by the NISSAN new vehicle limited warranty."

Whatever the tow truck needs so you can get it to the dealership and trade it for a decent car.