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Testing is nice, but frankly we have a pretty good archive to know what works based on previous user experience.
If you can't reliably test fuel economy, use coast down tests. If you notice more speed at the bottom of a hill you always drive, then your mod is working. I've always found that this is noticeable in the airdams I've done.
I've also found there's a lot less noise coming up from under the floor.
The actual fuel savings are harder to measure, but if it does the above then it's got to be helping.
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