And.... isn't LPG exhaust primarily CO and not Co2?
from airqualitynews...
" an LPG car was estimated to emit 19% less CO2 compared to petrol, making its performance similar to that of a full petrol hybrid car"
"an LPG van has been estimated to be cleaner in terms of both CO2 and NOx than petrol, full petrol hybrid and even Euro 6 diesel alternatives."
no idea on CO but sounds reasonable
 
i know its not counted for emissions purposes, but i'd love to know what the emissions are like during a DPF regen
https://core.ac.uk/download/pdf/38621432.pdf

During regeneration of the DPF a significant increase of the emitted number of particles is observed. Size spectra reveal a nucleation mode peaking at approximately 10 nm, at concentrations that can exceed the emission levels under non-regenerating conditions by more than three orders of magnitude.
 

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