specific heat of petrol air

[chhitiz]

what are the Cp and Cv values of petrol and air?

[mgb_phys]

http://www.engineeringtoolbox.com/specific-heat-fluids-d_151.html

[xxChrisxx]

Use gamma = 1.3 for the polytropic constant.

Note: If you aren't using the cp and cv values to find this, ignore the above. If you are congratulate me for being clairvoyant.
EDIT: It also depends on the blend of petrol and the fuel to air ratio (if you want to get technical and accurate)

[chhitiz]

Gee thanks! but that's only the Cp value. what about the Cv value?
and yes i have to calculate specific heat ratio