I'm looking for some help with the stoichiometry of gasoline. 14.7:1 is commonly cited as the stoich ratio for gasoline and air. I believe this ratio is calculated using a primary reference fuel consisting of a mixture of n-heptane and iso-octane. Precisely what mixture is unknown to me. Could someone walk me through the calculation for determining the stoich of gasoline? Is there a way to work backwards from 14.7 to determine what mixture of n-heptane and iso-octane is used for the reference gasoline? Or would the results be similar or the same no matter what mixture of those two hydrocarbons was used? Thank you for your time!