I got to 89.3 yesterday running up stream on my home lake. My goal was to hit or break 88. 2+2 w/250ProXS w/1.75 sporty. Light load, 1/2 tank of fuel, no wind, no current, very slight chop, water temp 70F, air temp 80F, 29psi, rpm guage showed 6k rpm but it was slightly less on the merc...