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My Genesis G80, 2018, 3.3T is not picking up speed as before and hesitates when I hit the gas to accelerate at times. It has 56,000 miles now and I purchased it with 29,000 miles about 4 months ago. Should I run premium gas at all times or could it be tune-up? Just had it serviced at dealership 2 weeks ago and they didn't mention the problem at all but charged me for other suff. Help!

