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4thoughts:
First, donut wheels, are narrow AND they are built of thinner gauge material. That means they aren't desiogned to last 10's of thousands of miles - only what they claim - 50 miles at 50 mph.
Second, if you mount a tire on a rim that is too narrow, then the tread will arch and not only will the tire wear in the middle, it will tend to follow the ruts and grooves in the road and be sensitive to cross winds.
Third, narow tires don't save fuel. Tires with bigger load carrying capacity do. But the effect is small. Besides, going DOWN in load carrying capacity is unsafe - tires fail more often.
And last, you should spend your time researching low rolling resistance tires, Much more gains to be found there.
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