I run two tall bottles on my frame. I have the impression that it might make a Tilt difference in how I drink bottles empty. On rides where I drink first the front bottle and then the back bottle (I don't switch front to back when empty), my Analysis Tilt Chart seems to show greater variance from zero. When I drink both bottles evenly there seems less variance. I don't know if iBike engineering factors in bottle usage and placement in the Newton design but likely is a minimal effect.
So real nerd question concerning PowerStroke and Bottles. A partially empty bottle can produce a lot of slosh in the Front/Back plane. Slosh correlates closely with pedal motion. Likely two partial bottles produce even more sloshing force. In PowerStroke development was bottle slosh (bs) part of the testing and would the Newton/PowerStroke sense bottle slosh?
I hope to test PS bs on a flat section both with full, partial, and empty bottles when I get a chance
