After a successful Duna expedition I realized that without the lander the command ship had enough Δv for a brief visit to Ike to gather more of that sweet, sweet orbital science!

Thanks to a helpful gravity assist from the Mun, the crew made it back to Kerbn with a whopping 9 Δv left. If they didn't get enough aerobraking on the first pass it would have been next stop; deep space...