I had a 2017 Lounge, it did 43-48mpg, which was decent for the time of year. Nowhere near run in and neither is yours. With the 15' wheels had softer ride and a lot more grip too over previous 1.2's I'd had. 38 not bad. My TA 4x4, if I don't do motorway and A road inside the next week will be scraping 30mpg.