Only done 2K and level just under 1/2 way between full and X mark. I have the old X mark dipstick. I was unable to read dipstick correctly until i'd done about 800 miles and maybe its risen 1mm? I have a 1000 mile trip coming up shortly so will check oil level again after that. So I estimate at worst it might need attention around the 5K Mark, if it gets the ecu update AND a new dipstick that should it fixed.
mileage - my high score is 68.7mpg but normally getting around 50. In town around 45. Vibrating mirrors not seen it happen up to 70mph , maybe I need to go faster? It could be more pronounced with the 19" tyres due to harder ride.
I've test driven four CX5's only one had the vibrating mirror, and it was noticeable at 60mph! And only the drivers side appeared to be affected.