freebird_78
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- Joined
- Sep 4, 2022
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It could certainly be coincidental or even placebo, but it SEEMS like this particular engine (I also have a Charger with the car version of the 6.4L) is "picky" when it comes to fuel quality. I DON'T mean octane ratings, I mean top tier vs not top-tier gas.
I've tried running higher octane (91 is the best we get here) vs mid (88 here) vs base grade (86 here). Those didn't seem to yield any significant milage change, one way or the other. I tend to drive the same "loop", so that variable is relatively controlled. But what I do seem to see is whenever I fill up with lower tier fuel, I get about 1-2 MPG worse. Right now, I'm struggling to get above 12 with crap gas, where I'm usually above 14 and even 16 MPG on highway stretches. This isn't one tank or one point of data, either. Seems to be a pattern.
Problem is, I can't understand WHY. As I understand it, top tier just means a better additive package (more/better detergents), where a lower tier just cheaps out on the qty and quality of the additive packages. This, in my head, shouldn't have any bearing on mileage. At least not anything significant. I've also not noticed this in any other vehicle. It doesn't make any sense to me.
Has anyone else seen anything like this behavior?
I've tried running higher octane (91 is the best we get here) vs mid (88 here) vs base grade (86 here). Those didn't seem to yield any significant milage change, one way or the other. I tend to drive the same "loop", so that variable is relatively controlled. But what I do seem to see is whenever I fill up with lower tier fuel, I get about 1-2 MPG worse. Right now, I'm struggling to get above 12 with crap gas, where I'm usually above 14 and even 16 MPG on highway stretches. This isn't one tank or one point of data, either. Seems to be a pattern.
Problem is, I can't understand WHY. As I understand it, top tier just means a better additive package (more/better detergents), where a lower tier just cheaps out on the qty and quality of the additive packages. This, in my head, shouldn't have any bearing on mileage. At least not anything significant. I've also not noticed this in any other vehicle. It doesn't make any sense to me.
Has anyone else seen anything like this behavior?