Biggest tire in stock?

How big of a tire can I put on my stock taco? Can I do a drop bracket with body lift and run 35's?? How do I improve my mpgs?
 
I'm running 285/75/16s on my TRD 16x8 rims. Hate these meats but I'll run 'em down & never recommended this tire. Size is fine & hasn't affected MPGs.
 
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