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35's are great for offroad. 33's are a good all round size. Your fuel economy wont vary much but your speedo will be out and in being so will actually read less on your odometer than you have actually travelled (hence thought less mileage) as a 35" tyre doesnt have to as many revolutions as say a 31" tyre over the same distance and since your speedo etc is calibrated for 31" tyres it will be out. An example of this, me and a mate travelled to gympie myself on 33's and my mate on 35's when we got to gympie (150km trip) my trip meter said i had travelled 20km further than him (both zeroed at start of journey). As 35's wont have to to do as many revolutions your engine wont have to rev as hard, 4.6 diff ratios (2.8TD) will bring your speedo and revs back it to alignment with standard. Then if you do a lot of offroading reduction gears are awesome and by memory i think retail for about 1250-1350 and a GQ transfer case is chain driven (this job can easily be tackled in your shed on a weekend). Hope this helps.