Consumption in practice T6 vs. D5

Hello, first of all good day, I am new here. I am about to order a new V60, as successor of a (very good, but actually too big and too expensive BMW X5). Now my question: The stated consumptions are always more theoretical, because according to EU standard determined on the test bench. I have driven for years now large, strong diesel 6-cylinders and do not know if I should take the 215 hp diesel or the strong petroler ? I drive about 35 TKM a year (according to country road/short I drive foresight and with a rather light gas foot, with the X5 I use on average 10,2 l/100km. Who knows both and can tell me what they consume in comparison in everyday life. Thank you for the answers, Greeting Gerhard from the Oberallgäu