Squeezing the best mpg from a RV

@Minnemike, have you seen the bumper sticker" “You may have the right of way, but I have a truck”? You won’t be rear-ended. Everyone except an 18-wheeler would lose in that match. And then they’d have to pay to fix your RV. Your RV is big, broad, and heavy. No worries. Unless you use that Mercedes-Benz cloaking device.