I am way late tot his conversation. I don't ride without the windscreen for about 5 years now. It is too hard for me to hold on for long periods of time with it off. The windscreen does not buffer my noggin at all.
I get about 28-31 mpg when just commuting for work. I get about 31-34 mpg when Pretty Pillion is on the back and we are taking the back roads for fun.
I have RamAir and worn out TORs with holes in the crossover pipe on my '14 R3T. However, that is about to change as my Viking Exhaust is about to go on and I'll get a Dyno tune as soon as I arrange it. I'll see what mileage I get afterwards.