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Hi Craysus,
Hard to give precise info on the fuel saving as it various a lot. But somewhere between 2-4%. They are very efficient on stability, less spray and dirt at the rears. Even on 2 tankers that we have. There are some independant road tests on V-Spoilers web page, including one from Australia.
We fit the panels on mostly at the end of each trailer (also double trailers). Also on all the tractors, that helps a lot in strong cross wind. Sometimes the panels don't fit, so we switch to their single units (but takes longer to mount). We dont fit in other locations, as we dont like how it then would look.
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