2011 mpg

Hey guys new here so be easy....I just got a 2011 tacoma with a 6" db lift with blocks in the back on 37" toyos and stock gears....going tomarrow to get 35s and order 6" lift springs......what gears would be best for my mpg.......and is anyone running a chip....the exhaust is strait piped very annoying...what mufflers would work....this will be 80% dd and the rest will be trails and regular wheeling no rocks....sorry if this is to many questions at once just lookin for info....I just came from a 7500 lb smoke blowin diesel....can't wait to get this thing trail worthy