Diesel is a heavier fuel, so it contains longer and more complex hydrocarbon molecules which, if partly burnt, form particles; soot, basically.
Gasoline molecules are smaller; once they break apart the remains are too volatile to create soot and will generally burn up too or form single CO molecules.
Plus what me_and_my_metro said.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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For education go to people unlike yourself.
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