Concrete is a whole system. Not just the rebar. Start with proper compaction of the soil underneath. If you are on decent hardpack then worry about fill. Use the right kind of fill, and compact that. Your rebar spec sounds fine, but the mix of concrete you get will determine how long it lasts. For just car support, 3500PSI pea gravel will do the job. HOWEVER - almost all the time when you order small batch load of concrete from the local vendor, you are not getting actual 3500PSI. You are getting something less. Which means you need to order 4000PSI and tell the vendor you are going to do a slump test on it(google concrete slump test). This will let your concrete vendor know not to cheap out on the cement in the mix.
I'm not a concrete expert, but I've done enough work to know that I've gotten a bad batch a few times, and it really irritates me. My boat ramp was 5000PSI and I had to send one load back. It was far too wet, and way to loose. They don't like that but too bad, I'm not paying for junk that will split after 4 years.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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