2016-2018 Range Rover Sport
have a '16 RRS diesel HSE. Question for the group on mileage. Computer seems to be 2.5 to 3mpg more optimistic than my calculations at fill up. I simply divide miles driven as posted on my speedo by gallons bought. Computer usually says 25.5 to 26.5 as the total where my calculation can be any where from 22.5 to 24.5. Thoughts on the discrepancy?