I know full well you know how to FP. However I was simply observing based on the information you gave you could do the same route OCAS with hardly a deviation. The observation was made in case I was wrong as I dont know your starting point.
I am not set on falling out with you, you are set on trying to make a point.
The route OCAS is longer as I have to cross east to west before I can head south clear of CAS. At SAM I have to deviate further or accept the water crossing at low level under the airway. Flying that distance low level uses 20% more fuel and takes longer. The route on the airway is more direct. I have a JAA Instrument rating.
All of these reasons make it more sensible to conduct the flight on the airways system. When the need arises I will fly VFR, as IO quite rightly points out tools for the job. When I am flying VFR it is because the conditions are VMC and as such I am quite happy to take a FIS or even not talk to anyone.