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The real deficiency in space savers seems to be the tire, not the wheel. I know of several people that use them as wheels for their race cars and they exceed 130mph on them. At least one car is running about 160mph on space savers. The tires have been replaced, but the wheels are stock space savers (except for the tabs to hold the moon discs on).
I think the biggest challenge with using them is finding the right size tire.
I'm personally skeptical about wider tires being better than narrow for efficiency. That doesn't mesh with my experience so far.
Mike
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