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Originally Posted by Phase
It’s just weird how they are more efficient at higher speeds than slower speeds. It’s almost like going slower gives worse mpg lol
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If you have high rolling resistance, the impact to fuel economy will be most apparent at lower speeds where rolling resistance accounts for the majority of energy loss. It will be less apparent at high speeds where wind resistance accounts for the majority of energy loss.
You should notice improved MPG as the miles accumulate on these tires (although maybe not since cold weather is coming).
My other question is if the circumference is the same? I believe it is not recommended to vary diameter more than something like 6%. Just going from bald tires to new ones with full tread can account for a significant difference in circumference. That will affect the accuracy of the odometer and MPG calculation since these do not account for changes in circumference.
For vehicles I own, my preference is to get cheap steel wheels to mount winter tires on, and swap them out myself as winter conditions set in. I've got a jack, stands, and various wrenches that allows me to get the whole thing done in something like 15min. Many tire shops will do free wheel swaps if you buy tires from them.
... this reminds me, Christmas tree hunting in T -3 days. I'll likely need snow capable tires up in the hunting grounds around Detroit (Oregon).