We added airtabs in 2009 before we did a southwest trip. We have a 2003 Southwind 35r that we tow a 16 foot flatbed with our Prius on top and were getting about 6 mpg. I saw the Airtabs advertisement and went to the web site to check them out. The site did a good job of explaining and showing how the air tabs work so I figured given the trip length the cost of the air tabs factoring in the saved gas cost I should break about even. So I bought and installed them as well as a F&N 100k air filter. I typically only drive 60 mph and 55 mph when the speed limit drops. I noticed I was getting 7.5 mpg which was a huge increase. The added benefit is I get little or no wind turbulence from big trucks as they pass or we pass them. I do get some when the wind hits my trailer but the air tabs are well worth the cost and not only pays for them self over time does improve handling significantly. I have not seen anyone else who has them but I have been asked several times about them. My recommendation is get them, they are well worth it - happy rving
