Just changing oil grades by themselves, I’ve never noticed a single gain/loss in MPG in winter or summer in any vehicle we’ve owned. I think that a lower oil grade in addition to all the other benefits that the manufacturer puts into the automobile…or removed from the automobile. Such as lower overall & unsprung weight, better aerodynamic, fuel saving devices, engine/transmission designs, tires, etc.
I’ve put on lower rolling tires(not dedicated LRR), lower grade oil(from 5w30 to 0w20), removed roof racks and extra weight/junk in the trunk all at the same time and didn’t notice enough fuel economy gain to mention.
I have also loaded my vehicle to the hilt on a family vacation driving from NY to FL and back and have gotten among the better MPG figures in that vehicle ever.![Man shrugging :man_shrugging: 🤷♂️](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f937-2642.png)
I’ve put on lower rolling tires(not dedicated LRR), lower grade oil(from 5w30 to 0w20), removed roof racks and extra weight/junk in the trunk all at the same time and didn’t notice enough fuel economy gain to mention.
I have also loaded my vehicle to the hilt on a family vacation driving from NY to FL and back and have gotten among the better MPG figures in that vehicle ever.
![Man shrugging :man_shrugging: 🤷♂️](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f937-2642.png)
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