My 2015 f-sport has been very reliable, the only costs of running todate has been annual services/MOT, 1 set of wiperblades 2 sets of front tyres and 1 set rear (front and rear will need replacing soon). As it's been serviced at lexus giving me 10yr warranty they've replaced the water pump and rear bushes all under warranty. MPG is 40.6 that's a mix of roads, single driver to fully loaded 4 adults, 4 case's, 4 sets of hand luggage (and I mean fully loaded).
Hope this helps