I always use premium fuel for this car. I think it's usually Chevron 91 octane.
The car deserves it. And it's alot of fun on uphill winding mountain roads.
I use the regular stuff in my 80 series Land Cruiser Beast.
I've got about 26,000 on mine right now with the 18" rims and maybe 3-5,000 miles left on them. I drive about 95% highway miles. The Turanza tires are Ok but I won't be getting them again. They are too noisy.