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Made a 25 mile trip on the interstate. Instant mgp was running from 26 to 31. On return trip the mpg dropped down to 19 to 24 and the engine did not sound right, sounded like it was laboring. Stopped in to my dealer and they could not find any codes in the computer. Don't know what to do.
This is a12 Terrain with the 2.4 engine. 2200 miles.
 

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Doug,

Did the dealer offer to keep the vehicle to take a closer look? I would be happy to look into this for you. Please feel free to contact me with more information for further assistance. Thank you.

Tricia, GM Customer Service.
 

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I would have the dealer keep it, and give you loaner...
 

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Get a gps that has elevation and display it during that trip. I suspect you will find it is downhill going and uphill on the return.
 
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