Quote:
Originally Posted by Dog Face Pony Soldier
I'm still surprised. Why different approaches?
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Different types of emissions. The "P" in GPF stands for particulate, which is the main source of smog. That's what they are after with the GPF, which eliminates 70~90% of particles, so it is worth the tradeoff of the slightly higher fuel consumption. It is the same type of tradeoff than with a catalytic converter.