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This study quantifies fuel savings and conditions for the application of coasting phases, i.e. the vehicle rolling without traction force in an automated driving strategy, herein named economic cruise control ECC. Under the presumption of a driver input lead velocity and a limit of acceptable delta speed deviation, fuel savings can achieve values of 5 % to just above 10 % on highways traveling with a conventional, non-hybridized powertrain, assuming that the ICE is stopped upon coasting. Lower mean speed driving yields relatively higher savings. Reference is constant speed driving at the identical mean velocity, such that an ECC function may obtain somewhat higher savings in real traffic environment. For a first version of driving and powertrain control strategy it could be shown, that the fuel economy of a hybridized powertrain can benefit from coasting, too.