Gasoline / ethanol /methano vapour properties

[Bensmit]

For a project for petrol vapour recovery, is the viscosity of ethanol / methanol vapour much different from petrol vapour? Does anyone have viscosity data for these three gaseous fuels?

 

[dcasto]

since they are gases, the viscosity will be nearly the same .007 centpoise

 

[Bensmit]

Thanks for that - I have seen a lot of hydrocarbon gases are around the 0.007 centipoise figure. Why then does air, also a gas, have more than double the viscosity (0.018 centipoise)? Is it dependant on molar mass?