The C151 will drop your rpm ~300 @ 55 mph (2300 to 2000). This is a step in the right direction, however I don't think you'll see a big gain from such a small decrease in rpm. I think you'd need to see a reduction of 500+ rpm to really see a good bump in mileage.
I have done nothing with regearing the Paseo. I currently use P&G to overcome the bad gear ratios.
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