I had posted recently about my port engine transmission running 14 degrees hotter than the stb This is at cruise after about 10 minutes and does not change after that. I now realize that the port engine burns very slightly more fuel than the stb, at the rate of about 2%, ie: maybe 5 gallons more over 200 gallons of burn. I have a Sea Ray 36 Sedan Bridge with Cummins 380 hp. year 2009. The oil samples are good, the engines both run a constant 175 degrees. Question- is it possible the port engine is less efficient and transmission a little hotter because of the counter rotating prop?