Look pal, I do not want to change this thread into a slugging match. I am just going to state once and for all that aerodynamics and physics are unflexible, you can improve on them, but going faster at hevier all up masses requires more power, and when you go over a certain threshold your fuel flow rate increases drastically even for modest speed gains.
I have never said the 175 sucks, perhaps it does, perhaps it does not.
What sucks for you is that in your job, and considering the professional forum attendance, stating half truths and keeping a similar attitude is only helping the competition.
Have a nice day.