I used to have an HF 5th gear in my crx si, I remember having one tank at 50 MPG but most of them were mid 40's but this was before I was into hypermiling, I still had the si final drive, I had put the long gear in just to get back and forth to the autocross. I still have the gears if anyone is interested in buying them, I know I have them somewhere burried in my garage.
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