Quote:
Originally posted by Rafi
inspector1 - why is using gasoline from summer without the oxygenates a bad idea?
Because gas goes 'bad' in about a month or 2, it draws water, and begins to decompose and then does not burn effectively.
Yes, I have noticed too that in the winter the gas milage goes down. It is consistent, since oxygenated fules are partially oxidized or burned so they do not have the same caloric energy as plain hydrocarbon, therfore you use more fuel. Now if you use more fuel does the HC emmision go up?
Not nessarily, if quantity X of gasoline burns at 98% complete combustion, then 2% is emitted as HC's. Hoewever, with less milage returned, then quantity X only gets you 3/4 of the distance so in a years time, one ends up burning 1/4 more gas, emitting 1/4 more emissions total.
... If oxygenates increase HC emission then certainly reducing the oxygenates content in gasoline will have the right effect for my situation.
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This is backwards, oxygenates are supposed to help combustion go to completion, decreasing HC emissions for X volume.