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Sky, a few thoughts for cost effective testing. (1) Tufts to confirm attached flow; 20 mph minimum according to gurus. (2) Find a nearby hill to make some "soap box derby" runs in concert with ABA changes; if you have GPS that might help if the data isn't too dirty. (3) If your truck has ODB then a ScanGauge offers sensitivity over short road sections.
Rock on!
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