Originally Posted by Sylvainsting
...According to you what is the best RPM setting for best cruise efficiency...
This may sound flippant (not intended), but what do you consider "best" with regards to the broad term "efficiency". Efficiency is often thought of as the least input for a given output. What is your output?
Are you tying to maximize endurance, range, or speed?
Example: My Taylorcraft burns 4GPH, while my Rocket burns 12GPH - which is more efficient?
If the per hour cost is considered, then the T-craft is very cheap flying indeed. However, if the cost per mile traveled is important, then the Rocket comes out on top.