On running gasoline on the Varian CP-3600 DHA, The area of the i-C5 & 2'2-DMB (which represents about 20% of the samples) is not repeatable; giving a greet variation in the results (about + or - 2%).may the injector temperature (275 ºC) cause such problem or the auto-sampler used (Varian 4800) is not good for these volatile samples.