hi, i am going to pick up my galaxy, 2.3 mrk1 ghia, tommorrow and want to know if the cruise will work at 30mph, will it hold at 30mph when i activate it, it did not work at 30 when i took a test drive so the garage said they woul fix it, so i am just making sure, before he says 'it doesn't work at 30mph, it's to low a speed'. thank you.