Tires for Toyota 4Runner

[Graystroke]

What size will fit and yield the best MPG on a '87 IFS 4runner?
Will 285/75R16's fit? will they suck on the highway w/ the mighty 22re 4cyl pushing it? The truck has a five speed. Anybody have some 31X10.50 AT's or Trail tires they want to unload?...god ones, not spares.
Also, will all 6 lug 'Yota take-off wheels fit this truck? Will I have to jack w/ the center caps etc.?
I would like to get just plane steel Tacoma take-offs if they will work.

[Graystroke]

like these, will these alloys work?
http://austin.craigslist.org/pts/173334488.html
or these steelies
http://houston.craigslist.org/pts/172484565.html

[uglyota]

31s should fit well, whatever came on the truck will get the best gas mileage (245s maybe?), the lug patterns are of course all the same, if you've got manual hubs you will probably have centercap issues with the first wheels, I think the second set should work fine...they were designed to pry off the center cap to access the hubs