Have only had our RV since last October, so I have not had a lot of trip planning experience. However the couple of times I have planned something more than a weekend trip, I have referred to MapQuest or to Good Sam Trip Planner (both online). I have realized for both that the trip time seems to be based on Speed Limits. However, I typically don't take our Class A DP over 65.
Is there any kind of online trip planner that allows you to adjust for the actual speed you'll be travelling, even if less than the posted speed limit?
(If my trip is 800 miles one way, I'd like an easy way to figure out where 400 miles is, so I can plan the overnight stay on the road)