Has anyone tried- - - - results

I have the fans on my fridge. Easy way to keep rear fins defrosted. Also balances temperatures from top to bottom of fridge.
I have air tabs. Do they work? Yes. Do they save fuel? If they do it is very small. Handling is improved with side winds. Best place I used them was on bottom of cab over. Stopped wind noise around cab side windows and doors.

Also, putting nitrogen in your tires will almost double your gas mileage...:W...Dennis

There is a reason you don't see air tabs on truck fleets. What you do see is skirts and tails.

Air tabs are merely vortex generators and you can make your own. Buy some plastic angle stock, cut a bunch of short lengths and try them on one side of the RV....they need to be cocked a bit relative to the air flow to do their thing. You can stick them on with double back foam tape and they will stay long enough for a science project. They don't have to be the same shape as air tabs. After a while if they do work you should see a difference in the dirt from one side of the RV to the other. Just to make sure then move them to the other side to account for the variable of one side being more exposed to traffic vs the curb side. Google images of vortex generators and you'll see all kinds of them.

Here is all there is to know about Air Tabs Just click around.
Air tabs
Also a few threads on the subject.

HERE

And HERE

I use this & it does help, about $20 on Ebay.

Unit is self grounding, in-line fused power lead connects to either the interior door light or through the frig safety drain down to the 12 volt power supply on the back of the frig. About 5-minutes to install.