NHTSA opens preliminary probe into more than 870,000 GM vehicles

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djnice

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To me it seems like the 5.3 downshifts a lot. Slight throttle and it downshifts. At 75+ it stays in 9th a lot. I figure its time spent in higher gears is making it get worse mpg.
 

jfoj

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Different video with interesting info but it has the same thumbnail background, it is not a duplicate.

 
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