Mileage Drop in Chevy Traverse after Faulty Timing Chain was Replaced?

I recently had the timing chain changed in my Chevy Traverse. It has 32000 miles. After it was changed my mileage dropped from an average of 20 mpg to 15 mpg as calculated by the on board information system. The service technician at the dealer says there is nothing wrong with the vehicle and there is no relationship between the mileage drop and the timing chain replacement. Although the drop was immediate after the replacement. I feel as if it is now harder to accelerate since the timing chain was replaced. Any help would be appreciated.
Mileage Drop in Chevy Traverse after Faulty Timing Chain was Replaced?
Poletowner any time your not satisfied with any Type of repair a dealer makes and it sounds to me like your complaint is a good one.Please call the dealers service manager and ask to see the chevrolet factory representative.Or as we call them the factory rep.All dealers are bound by what the factory rep says.Please explain whats going on with your traverse and ask for a correction to put things back the way they should be.There is no reason after a timing chain replacement your traverse should be running any different as it was before.Best of luck.

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