Speed or wishbones
I suspect that your speed and traffic patterns have more to do with the MPG. In a previous forum discussion it has been noted that the difference in mpg at 75 mph and 60 mph can be easily 20% and maybe 30% different. Traveling across the country from Wisconsin to California late last Summer, I was traveling at speed from 65 to 80 mph and got terrible gas mileage compared to other identical RVs. The experiences ranged from my 8 mpg to 12 mpg for very conservative drivers. Maybe I should have used the miracle plastics. My RV engine was brand new as well and not broken in.
I'd love to see additional accurate testing procedures done to convince me to plant a few hundred on these wishbones on my RV.
Airplanes have certainly seen some benefit on their wingtips or they would not have gone to the trouble.
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