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I don't think its one very specific tactic... any time the engine spends off is going to let the cat cool down, decreasing its cleanliness. Turning the engine off at lights, coasting, P&G, etc.
I wonder... do modern hybrids have small cats/pre-cats designed to cope with this where non-hybrid vehicles do not? Do they have a special heat wrap or thermal insulation to retain heat between startups that may be minutes apart?
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