See also:

Fuel requirements
Your new vehicle is designed to use only unleaded fuel having a pump octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher. Your new vehicle is designed to obtain maximum performanc ...

FULLY LOADED YET DISAPPOINTING INTERIOR
The same cannot be said for the interior. While the swooping design of the dash is nice, it’s really only visible on the passenger side. As for the temperature controls, they appear out of place ...

Roomy New Interior
However, the Optima's quiet new interior is more upscale and will accommodate four tall adults, or five in a pinch. Front seats are supportive, and the rear-seat area is impressively roomy—alt ...