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I was wondering what mileage increase anyone has seen with the .658 5th gear. I have a 2000 jetta tdi.
 

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I saw none but rpm were lower. It was a fun project but if I had to do it again, I would have gone with slightly larger tires. It really depends on how often you drive highway. Some have claimed a small increase.
 

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Since you're asking about mileage increases, will the fuel savings equal the cost of the mod or are you doing it to have a fun project?
 
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