Hypothetical transmission project

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Okay so like $200 for brand new parts to put the 5th gear in and you figure it gains 2-3 mpg it will definately pay for itself over time.
 
I tried something similiar.

On my s300, I adjusted the 5th gear fuel tables to -5%. Unfortunately it didn't work at all. the only thing I noticed was the engine ran a little hotter, thus not combusting as efficently, and causing me to use more gas. :(
 
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