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14 . According to Hypertech, the 5.3L really responds to tuning as they managed to pull an additional 16 hp and 13 lb-ft of torque, even with the Max Energy set on the 87 octane tune. Considerably more power is available if you’re willing to fill up with premium fuel, but with gas being $4.35 right now, we’ll stick with 87. Check back next month, where we’ll dress up the exterior with a new grille that dramatically changes the personality of our mommy mobile.