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taller 7th wouldn't help much. I have a 6MT and cruising at legal hwy speeds I'm already at 2100-2300 rpms, anything below 2000 rpm and the car will be easy to stall in case of a sudden slow down. also changing all gears ratios will have to be considered when changing 1 gear, so you may be changing the acceleration characteristic of the car when you do this.
Start/Stop def gets figured in the road test portion of the tests, and it easy and cheap to install as others have mentioned.
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