Don't know what bike you're proposing to use, but if you swap it to a BMW F800GS you'll get nearer 60mpg, halving your fuel bill.
Swap it to a much smaller bike and you'll get even more - Simon Gandalfi uses a 125.
Buy a cheaper bike and your carnet costs will plummet too.
Accommodation in Africa will be much cheaper than Europe of course, and you can wild / free camp in a lot of countries, even places like the States. That will allow you to spend more on a nice hotel now and then to have a good spruce up. Your food and accommodation prices look a little stingy but I've not done much travelling in the more remote places so perhaps things will average out as you have guessed.
One thing I have heard is that the slower you travel the cheaper it is.
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