Premium, yes. But 91 or 93 might not be something the dealer knows. Also, if they've been letting people test drive it on the wrong octane, you're going to have a bad time. You need an oil analysis and compression test asap, and set aside money for a retune with your elevation and fuel.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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