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 - The Perfect Restoration - by Chris Pratt. Often, in quiet moments, I have wandered back in my thouhts to the many tractors I have seen over the years and wondered which one inspired me the most. Sure, we have a fond attachment to one brand and model or another, sometimes it was remembering that first time we got to climb up in the drivers seat and command that roaring beast, or maybe because when you see that special model, you can't help but see Dad on it, he's gone, but everytime you see a tractor like his, it's a like part of him i
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