The molecular structures of the DCAs, fuels, and deposits used in the current study are shown in Figure . We compare two amphiphilic DCA chemistries with the same PIB tail-group consisting of ten repeat units of the isobutylene monomer. The first DCA is a well-known non-ionic surfactant based on the traditional PIBSI formulation. It contains a succinimide moiety acting as a hook group, bridging the aliphatic tail-group with tetraethylenepentamine (TEPA) acting as the head-group. The second DCA is a zwitterionic surfactant with betaine chemistry, 66 containing a cationic quaternary ammonium and an anionic carboxylate group.