What about this? Should I also test a boxed cavity where the extension panels are "blown" as the Georgia Tech folks call it?
https://www.slideshare.net/Hondafana...-backed-trucks
They claim 5-6% improvement in fuel economy. They also tested a Suburban but it's unclear how that worked out for them, at least I can't make heads or tails of it.
It's not the best slideshow ever but it's interesting. Raises more questions then it answers for me though.
Another image by Aerohead/Phil Knox/PRK:
http://i1271.photobucket.com/albums/...titled1_16.jpg
Something about the panels being 42% the length of the body to get maximum benifit. That's far too much for me. I saw somewhere that someone said 4" is enough to get a significant improvement. Length of my jeep is 167 inches, 4 inches would be 2.4%, and 70 inches would be 42%.
That seems absurd to me. Almost half the length of the vehicle! I don't know about that but I also don't know much (at least I know enough to know that!)
This isn't boding well but I still want to test it. Either with a scan tool or by doing the down-hill speed thing.