Hi Usman,
The initial gas composition used in this tutorial is not based on the IVC calculator with the data from the reference attached along with the tutorial. For explanation of discrepancy (oxygen mass fraction of 0.147 vs. 0.137), the reference uses 5 component gasoline and it was subsequently simplified to a 1-component gasoline for this tutorial to run faster. I hope this explains the discrepancy.Â
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