Wow, what a popular topic!
While agreeing the idea of spending as much as you can afford on a compressor, I have a little tip from a farmer that helped alot on our trans africa trip.
Carry a long piece of hose (long enougth to stretch from your spare tyre to the farthest road wheel) with an adaptor on each end to fit the valves. Then when you get the chance blow up your spare tyre as much as possible. (60-100psi is usually possible.) This can then give you 1 or 2 full tyre refills before you have to resort to a pump.
Tom
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