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Originally Posted by freeside
My point in starting this thread, is to start gathering information on how to perform credible A-B-A testing on something so complicated to install/uninstall.
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Agreed -- it's difficult to test mods that are difficult to re/re. I only A-B tested my undertray, and it was only a cardboard mockup. (Easy to pull off fast, but not re-attach.)
Is your goal to measure the MPG change (if any), or just to know whether there's an improvement?
Because if you only want to know whether A is different than B, you could use coastdown testing instead. In a fraction of the time you're prepared to spend on highway runs you could get a lot of shorter coast-downs in for comparison.
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Should I leave the truck running in order to maintain temperatures and cruise control set point?
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You shouldn't have to keep it running to preserve the cruise set-point. (At least I don't have to on mine, but I use a kill switch to stop the engine. Not sure if the set point would stay if I went from RUN to ACC.)
Also, it's not just consistent engine temp that's important - transmission oil, tires, bearing temps all factor in -- the whole drivetrain. So it's important that whatever you do, there's an equal amount of driving/warm up time (assuming steady ambient temp) before each set of runs.