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Also, you want your rebar to be at the bottom 1/3 of your pour. 6" pour means the rebar should be at 2" from sub grade. That's where you get your strength from rebar. The bottom 1/3rd.

8x20 is 160 square feet. At 4" thick it's only 2 yards of concrete. At 6"thick its 3 yards. Either way your paying for a minimum cartage charge. If it was mine, I would make it 6" thick, with #4 rebar, one foot on center. Wire mesh is good for tomato cages not a concrete driveway. Also when...