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Well, I just put a K&N in my '88 Toyota - not in hopes of increasing mpg, but because I don't like throwing away stuff. I've been getting close to 28.5 mpg over the last several tanks, so we'll see what it does now.
I did see a bit of an improvement when I put one in the Insight, but I couldn't say whether it was real or just warmer weather or something.
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