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I have used spares fairly extensively. I went up a very rough and long logging road in my Legacy and had a flat. The spare held up on the punishing decent, and then kept on going for another thousand miles before I got new tires.
A spare should easily hold up for your light loads, and I should think they are very fuel efficient considering the higher than normal PSI (about 60psi if I remember correctly).
The main reason people are advised to not travel far on a spare is because having different diameter tires stresses the differential. Further, the handling characteristics of a car will be adversely affected by the smaller, thinner tire.
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