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barring a spedo being off wouldn't the simplest gearing change be a tire size swap... I was looking at old beetle tires.. 165/80-15's same tire patch size as my stock 165/70 13's but 15% taller..
For the speedo i was going to run a GPS.. most likely far more accurate than my 10 year old spedo.. lol
to calculate mileage just correct the miles by the tire size difference.
Best part is its easily put back to stock and only about 220 bucks to try a different gearing ratio with a new set of tires..
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