The key part is that petrol is mapped rich for the use of cooling at a minimal loss in power. LPG offers no cooling so overfueling is of no gain so you need to lean it back to correct burn
The injectors on petrol are opening for Xms to fuel the charge and Yms for cooling. We can delete the equal amount to Y as LPG is not going to give any cooling but with its resistance to knock needs the cooling less anyway
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