That mechanic seems to know nothing about regeneration.
It doesn't help driving the car fast once a week. Regeneration works better if you drive fast, but it doesn't start unless it's considered necessary by the car. Thus driving fast now and then of course increases the probability that regeneration is needed when you actually drive fast, but it could just as well be that driving fast fills the filter quicker, and the car then, at some less suitable time, finds it necessary to clean the filter.
One could imagine that regeneration doesn't start if the fuel level is very low. Just like the engine heater doesn't run if you are low on fuel. The latter is true, but the first I don't know about. Anyway, it's at least the opposite of what the mechanic said, i.e. that having a full tank increases the probability that regeneration occurs when actually needed.
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