The mixing of the hydrocarbon surfactant cetyltrimethyl ammonium bromide (CTAB) and the fluorocarbon surfactant, Zonyl-FSN-100 with the average chemical structure of C8F17C2H4 (OC2H4)9OH, is quantified. The critical micelle concentration (CMC), the size and shape of the micelles and their composition have been investigated by surface tension, fluorescence, small-angle neutron scattering (SANS), electron paramagnetic resonance (EPR), pulsed-gradient spin-eco NMR spectroscopy (PGSE-NMR), 1H-NMR and 19F-NMR. The pure surfactant aqueous solutions and the mixtures have also been studied in the presence of hydrocarbon oil (hexane) and fluorocarbon oil (perfluorohexane, PFH) in order to investigate the swollen micelle shape and structure. The surfactants mix nonideally except for a degree of ideality at some CTAB mole fraction (0.5 > αCTAB > 0.7).