90 km h in order to obtain the desired economy state i e the cruise brake speed interval of 7 km h the set cruise speed is replaced with a temporary cruise speed such that the cruise brake speed interval corresponds to the selected economy level in this case the temporary cruise speed value used as the actual cruise speed will thus be 83 km h in this way the desired cruise brake speed interval corresponding to the selected economy level is possible to reach the temporary cruise speed will be used until the economy level is changed should the economy level be changed back to economy level 2 the temporary brake speed will be set to a value corresponding to the selected economy level in this case the temporary brake speed will remain at 90 km h since the set cruise speed is 85 km h and the cruise brake speed interval corresponding to the selected economy level is 5 km h the temporary cruise speed can now be changed back to 65 km h if the economy level is changed when the vehicle is travelling with the temporary cruise speed of 83 km h this temporary cruise speed will remain until the actual speed of the vehicle corresponds to the set cruise speed i e 85 km h which will occur when the vehicle travels down a hill in this way there will not be a sudden acceleration of the vehicle when the driver selects another economy level if the driver disengages the economy function completely the cruise control will resume with the set parameters i e the set cruise speed and the set brake speed if a temporary cruise speed is lower.