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I don’t know if you already have or not, but just be sure you think about and monitor the heat from your exhaust as it relates to heating up the underside of your car. You don’t want to create an oven that has your gas tank inside. I won’t beat this to death again here, but search for heat and bellypan if you want more information; there are several good threads on the topic.
As for testing, A-B-A on a reliable and repeatable route same day is the best. Look at some of the tire size tests for some good examples.
Though not as accurate, week long tests on the same route (i.e. the exact same route commuting to work) with one week one way and the other week the other way can also give reasonable accuracy. The week length helps to average out small discrepancies as long as the weather is reasonably similar and you throw out any outliers. The advantage here is you can record the data from your usual travels without having to do dedicated drives just for testing.
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