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>We saved at least $10,000 by building a retaining wall ourselves. We mixed up over 6 tonnes of concrete in a 200 L concrete mixer.

I have done it both ways...

Concrete trucks are about $80-120 / yd. mixing bags of concrete, assuming you have free aggregate and sand, is about $200 / yd

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Well, if you're building a wall yourself, you can't use a whole truck load of concrete all at once. You pretty much have to mix it incrementally.

I am trying to understand your post. Is it cheaper per yard to hire a concrete truck than to mix concrete (with free aggregate/sand) yourself?

Presumably, to get the truck pricing you have to buy by the truckload which is too much concrete for some projects. If doing it onsite was cheaper at quantity, you'd never see a concrete truck on the road -- all the big construction sites would be saving money by mixing onsite.

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