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Here is my two cents.
1. must be using a scangauge or some system BESIDES filling up to determine mpg.
2. Assuming 1, then set cruise at a fixed mph and record results from scangauge.
a.) temp, rpm, ign etc
3. Where it is flat for a couple hundred miles, record then stop, clear gauge, put magnets on, and record.
4. record in the same place on the return trip..
5. BEFORE the trip, set up a basis for your car, running on a flat area to establish a baseline.
Now, if you decide not to do this, don't try to present to us that the magnets 'worked'.
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