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I purchased our 2014 Cruze diesel brand new from a local dealership. Everything was great until the vehicle O2 sensor recall/recalibration was done with under 10k on the vehicle. Since then, my mileage dropped significantly(averaging between 18-20mpg, with full tank range consistently indicating less than 350 miles). I also experienced a significant loss in power and driveability, with the vehicle lagging upon acceleration, and intermittent shifting issues. I have had it into the dealership several times, and they have repeatedly told me they can find nothing wrong. They also told me the poor mileage sometimes just happens! I am thoroughly frustrated with the situation, as the vehicle still has under 50k on it, and I really like(d) the power and mileage the vehicle had when I first bought it. Any feedback or suggestions on a remedy are greatly appreciated, and if I can’t find an answer I’m likely going to use it as a trade in on another vehicle before I start having costly repair bills to keep it on the road!
 

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Hopefully you have documentation of your visits. Have you directly contacted GM Support with complaints? I don't drop below 30MPG even when I am stop and go around town.
 
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