There was something about adding a Venus sidetrip on any visit to Mars. Why? It may have something to do with launch windows. They are rather long between the Earth and Mars. More than 2 years, as a matter of fact.
An idea struck me today that you may be able to harvest gases on the edge of Venus as on Earth. If so, what could you get? Perhaps you could get carbon dioxide and sulfuric acid. If sulfuric acid could be obtained, you could break it down for its hydrogen and combine it with the carbon dioxide and obtain methane and lox. If that's possible, you could run a shuttle between Mars and Venus constantly which would replenish fuel for the trip to the Martian surface and back to Earth. Such a case would lessen the need to carry so much fuel on each trip.
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