Neils, by real, I meant GPS verified/corrected using what ever methoh : no wind , triangle, head/down wind. I rarely had planes that had airspeed indicators that had the correct speed. Sometimes, it's the instrument itself, sometimes the pitot, sometimes the static, or a mix of the 3.
Anyway, with the answers I got here , I will plan for 80kts ..well 92 mph as the plane ASI is in mph . And this is more for a purpose of having the plane owner planing the trip that for me. He is new at flying and planning this trip ( 2000NM across Canada in April ) keep us busy and ''flying on paper'. And it's just 'planning'..it's gonna be what's it's gonna be the day I take off. Never flown a Savannah before, so it will be fun to see how it goes. Thanks all