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Any suggestions that are known to fit? Looking for an increase in gas mileage.
Thanks, Tom
A "cold air intake" is not going to affect your gas mileage. In fact, most of them draw warm, engine-compartment air. They're really just noisemakers on these cars. Your original intake does a pretty good job of drawing cool air from outside the engine compartment.

If you can find or adapt a long ram intake like a Legmaker for your application, you might see a drop in intake air temperature, at the expense of a tricky install and making your future air filter changes a pain in the ass.
 

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2020 300S 5.7L, Alloy Edition, Black on Black
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Any suggestions that are known to fit? Looking for an increase in gas mileage.
Thanks, Tom
Hi Tom,

Welcome to the board. As stated above, I would leave it alone, as the engineers have done a great job maxing out the efficiency of these powertrains already.

What kind of fuel mileage are you getting? Total miles on the car? Is E0 gasoline available in your area? I use 93 E0 and average about 17 mpg with my 2020 300S 5.7. On the highway, I can easily peg 30 mpg+ due to the MDS system. Pure-gas.org - ethanol-free gasoline in the U.S. and Canada

Car Wheel Tire Sky Vehicle
 

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2020 300S 5.7L, Alloy Edition, Black on Black
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2022 3.6L with 20s only can go 400 miles at 22.5 mpg (only 1100 miles on the car). I just run 87 octane.
But my 2018 with 17" wheels got 500 miles per tank @ 25 mpg.
No I don't believe the engineers have maximized fuel economy.
We would be interested in your progress. As you already know, 300 will get better mileage as it breaks in. Ethanol Free gasoline will add some mileage and a few ponies too.
 
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