I've seen as low as 17mpg with S1, but that was shortly after installing it and for some reason my right foot seemed to have swelled uncontrollably! Just the other day I had to round trip to San Diego and managed 24.56mpg at a fairly steady 80mph. I did jump on it a few times to get around some slowpokes at certain freeway transitions, but that's about it.
I installed S1 when my car only had about 3000 miles on it, but I know I never got 28mpg Hwy in stock trim, and never close to 24mpg City. I think you're numbers are pretty good. I wish I had those numbers 'cause gas costs around 50 cents a gallon MORE here in SoCal than you guys are paying in GA.
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