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.
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.
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