VEHICLE IS NOT DELIVERING THE EPA FUEL ECONOMY PERFORMANCE RATED. THE GMC TERRIAN FWD 4CYL IS RATED 22 CITY, 32 HWY, AND 26 OVERALL. I DRIVE 30% OF MY MILES IN THE CITY AND 70% HWY. MY VEHICLE HAS 5000 MILES AND I AM EXPERIENCING 17 CITY, 22 HWY, AND 20 OVERALL. ALL WELL BELOW THE EXPECTED RANGE. I AM A VERY CONSERVATIVE DRIVER, NO JACK RABBITT STARTS AT STOP LIGHTS, USE CRUISE CONTROL. I HAVE COMPLAINED TWICE TO GMC AND WAS TOLD IT TAKES APX 5000 MILES TO "BREAK IN" THE VEHICLE. I NOW HAVE 5000 MILES AND AM NOW BEING TOLD TO USE HIGH OCTANE FUEL. FUEL PERFORMANCE IS SO POOR I SUSPECT A GAS LEAK OR SOME FAULTY COMPONENT THAT MAY BE POTENTIALLY DANGEROUS DUE TO THE EXCESS CONSUMPTION OF FUEL WELL BEYOND THE CONTROLLED EPA ESTIMATES. *TT