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Message: <blockquote data-quote="AustinTX" data-source="post: 222793" data-attributes="member: 18717">The V8 will give you slightly better performance, at a 4 mpg penalty and it wants premium gas (see quote from user manual below). The V6 has better gas mileage, the HUD is the best feature on my car IMO, but with the Ultimate you give up the chance of using Apple Car Play or Android Auto. I don't see the big deal about the 17 speaker audio system, but I don't have the 14 speaker system for comparison and I am not an audiophile.Fuel recommendations:3.8 engine Your new vehicle is designed to use only unleaded fuel having an octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher.5.0 engine Your new vehicle is designed to use only unleaded fuel having an octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher. For improved vehicle performance, premium unleaded fuel with an octane number ((R+M)/2) of 91 (Research Octane Number 96) or higher is recommended.The question is, do you want the slightly better performance at a penalty every time you go to the pump, or the added features (try the HUD, I would miss that in every new car from now on). How often is 311 HP not sufficient? How much more is every tank going to cost you at a 4 mpg penalty and paying more for higher grade gas?</blockquote>