My fantastic Santa Fe Premier SE Auto Euro5 (non ULEZ) with a full service history and 38k on the clock will be 10 years old in May. In addition its 1 owner/driver will be 77 and plans to continue driving, whereas the wife plans to give up driving her 5 year old Mazda Auto CX-3 Euro6 with 19k mileage. We live just outside a ULEZ zone but rarely cross into it. We both love the high-up SUV diesel experience but our annual mileage is now only 5k, so do we keep the Santa Fe (pay any ULEZ and forseen repairs) and sell the Mazda or vice-Vera or sell both and get either a used Tucson or a Mazda CX-5 petrol?