The manual right in your glove compartment suggests no lower than 89 octane fuel. That being factual, in my life I've been taught "high performance" vehicles call for high performance care. Which is why we run Synthetic Oils, or some members of the forum run the ACES fuel addatives.
It's just common practice for me, my family has owned powerful V8's forever. If the fuel is finer (thinner?) then naturally the gas will be of better quality and won't gunk up injectors and will burn cleaner providing better throttle response and more power. 93 with an octane boost is to clear the system because there isn't a higher octane available than 93, except close to racetracks.
It's more important WHERE you get your fuel rather than WHAT fuel you get. ExxonMobil and Shell are the best places. So my answer why run 93... For overall performance and health of my car, so it lasts longer.
That's just my opinion, you don't have to agree with it, I'm alright with what I'm doing.
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Read your manual again. It says 87 is acceptable, 89 preferred.
The following is my opinion, based on experience:
Synthetic oil is no better than dino oil, this, based on years of having used oil analysis done with all kinds of oils. Walmart conventional "Supertech" is the cheapest oil you can buy, and performs remarkably well past 6k miles in my car. I generally use a full synthetic, for about 8k+
Fuel additives: The manual states not to use fuel additives. Many high performance publications, (That aren't benefiting from the makers of such product i.e. sponsorship/advertisement/partnerships) that additives are a waste of money and generally do more harm than good. No comment on the ACES other than I've tried it myself... I no longer use it.
Octane has ZERO relationship to cleaning ability. It is a measure of the resistance to detonate/knock. The higher the compression ratio, the higher octane you need. If you advance spark timing, you effectively increase compression ratio (not mechanically), and require a higher octane. (No need for high octane in our cars without a tune)
Higher octane fuel burns slower, which is basically how it resists detonating... without the higher compression, it may not fully burn, so you actually get less MPG and less power running too high of an octane fuel....
You live in NY, just like I do. NY years ago mandated all grades of fuel carry detergents. Used to be you only got that with premium, which is why all the "oldtimers" think you NEED premium, when they may not.
2006 LX/Charger manual, page 241:
"The 3.5L and 5.7L engines are designed to
meet all emissions regulations and provide
satisfactory fuel economy and performance
when using high-quality unleaded
gasoline with an octane rating of 87 to 89.
The manufacturer recommends the use of
89-octane for optimum performance. The routine use of
premium gasoline is not recommended. The use of
premium gasoline will provide no benefit over highquality
regular gasoline or mid-grade gasoline and in
some circumstances may result in poorer performance.