It should be a priority for store owners/mangers to have a quality control program which should include training. The store should have someone with adequate training for the group of employees to learn from from. A customer will most likely come back to a store that is honest to them.
I'm not saying the stores are responsible for uneducated customer purchases but someone should lead them in the proper path to what they want in their tank.
From my personal experience with "big box" stores is they DO have educated staff but not all of them.
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