Ideal Speed In Class A Gas MH

For me (me alone) the best speed to drive my RV is the speed limit posted on the road side signs plus a couple of MPH as that's what the flow of traffic is traveling. This may or may not be the most fuel efficient so if that's your question you might want to clarify the question. I do not want to be the obstruction in the road traveling too slow in the right hand lane so if the speed limit is 70-75 and someone is giving you advice that you should be driving between 60-65 for best mileage I would disagree with that scenario. I want to get to my destination safely even if that means I end up using a bit more fuel than would be considered optimal. 6.5 or 6.3 MPG is not as important that cocktail time. I want to ensure that I will make cocktail time!