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RPM TackOmeter on 2010 Chevrolet Impala

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
NO CODE- on flat road crus set,trans seems to shift down tack increase 4-5 hundred RPM. Is there a adjustment for this not to be so senceative ? My gas miles are down from sticker. 4-5 miles per gal.
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