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I disagree with some of the comments (just a little)
I had a 12 mile stretch in Sacramento where I did ALL my testing. I would run up and down and log both. Partly to show, that in fact, different directions do produce different results. Also, it gets you back to your next run! (so why waste a test run!!!)
After 5 yrs and 200k miles in the BEAST (Q45) I can assure you that method was absolutely predictable.
I alsway tested on warm dry days (over 75 under 100)
I would reset the Scangauge on reach run.
I always used the cruise for the run.
always used a landmark at each end (bridges)
But here is the bottom line.
CONSISTENCY (not distance)
A warmed up engine on a warm day will perform the same at 10 miles as it does at 1000.
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