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80% fat free would suggest to most people the product is 20% fat. That would make sense to most people.
20% fat added doesn't make much sense. 20% of the fat is added rather than naturally occurring perhaps? 20% of the product is added fat but it still contains another 30% fat that was already there?
The 20% fat added product may still be 5% or 95% fat.
At least in common language 80% fat free has a genuinely accepted meaning. 80% of the product isn't fat.