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Gas Mileage Comparison

Achlys

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Location
KC Metro
Vehicle(s)
2026 Mustang GT Premium 401A, A10, 3.55, AE, Bronco Sport Badlands Sasquatch
I’m not achieving more than 11 mpg, I’m getting concerned about my carbon trap removal and K&N filters installation I did myself can have something to do. Car was new as were the filters.

I may have a leak.

While I don’t mind efficiency since my other car is a Tesla, I care if something is working improperly.
Couple suggestions that you’ve mostly likely checked.
Keep it in standard setup, not sport etc.
Tire pressure is correct.
Drive like granny.
Hard to believe your mods would create your results. Take it to your dealer and run a diagnostic.
Curious how your vehicle works out.
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erocker

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Milwaukee, WI.
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'24 Mustang GT Premium, '09 Lexus IS250 AWD
Mostly city driving here and after almost 3 years (24 GT Premium w/PP, Auto) I'm right on 20 mpg.
 

DarkHorsePremium

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CA, Bay Area
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2026 Dark Horse Premium, Blue Ember with Appearance Package, 10 spd AT
DHP w/10 speed. Average.
17.5 around town
23 on the hwy as.long as I don't get on it.
 

tktrain

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Evansville, IN
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1967 BB GTA, 1972 351 CJ Mach 1, 1972 351 CJ Convertible, 2025 Dark Horse Prm
Well, since I'm running the Whipple, I have to use 91 octane minimum, but we have 93 octane all over around here so that's what I run.
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