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Old 07-07-2010, 10:14 PM   #1 (permalink)
jamminjimmy
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Join Date: Jun 2009
Location: Boise
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CRex - '87 Honda CRX Si r
90 day: 34 mpg (US)

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How many gallon fillup for accurate MPG readings?

Hello all,
How much gas per fillup will give fairly accurate MPG readings? I am starting to pop regularly into the 40+ mpg range ("I'd like to thank the academy for this wonderful trophy- and of course, ecomodder for all the learnin"....) and am getting impatient driving 400 miles for results.....
I have a '87 CRX, so no scangauge, and I'm still researching mpguino, etc options....
- Is 5 gallons enough for a rough idea of MPG?
- I'm planning on 5 gallon fills(I still have a bunch of mods I want to test out), then if something causes a mpg spike, going back and averaging larger tanks for better accuracy.

---thoughts?

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