On the assumption that we are talking about a push bike and not a motorcycle then a) the weight will be insignificant, b) its unlikely to do much to your fuel consumption, the only time its likely to have any affect is a high speed on a motorway so once into Africa you aren't going to have that problem. c) Providing its strapped on properly its shouldn't have any affect on safety, just wait until you see some of the african vehicles with goods stacked metres high onto the top of vans and trucks that weren't meant to carry weight on their roof. d) you could use it alot or a little, really depends on you.
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