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Old 04-24-2011, 10:49 PM   #5 (permalink)
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Location: Tustin, CA
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2013 STi *SOLD* - '13 Subaru Impreza WRX STi
Sports Cars
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90 day: 26.59 mpg (US)

1996 Geo Metro *RETIRED from Ecomodding* - '96 Geo Metro Base
90 day: 58.68 mpg (US)
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Originally Posted by dieselbeetle View Post
Well, I've been using for quite a while to track mpgs. (which is where I get previous #s)

For my experiment with the kammback, I drove around town with it for a few days. Then to test it on the highway, I fueled up, hit the highway and came back to the same station and refueled in EXACTLY the same manner, for a round trip of 57.6 miles @ 1.040 gallons.

Unfortunately, I don't have a scanguage at this time. I'd love to get one, though. I think that if I was able to get a "live" or "immediate" reading, it might even reveal more mpgs. I say this simply because I did have to enter/exit the freeway.
Sorry, not trying to rain on your parade, but a 33% gain from before is a bit much (considering MetroMPG only achieved a 15% gain from a full boat tail).

Since you dont have a scanguage, i strongly suggest testing tankful-tankful, instead of relying on small fillups. Small fillups are very misleading because they don't average out any "miscellaneous" factors that could affect your mpg readings. Try to get as many tankful readings as possible to strengthen any mpg results you are achieving.

If you can only do short highway runs, at least try to use the cruise control to cancel out your "foot bias."

I highly recommend reading this thread

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