After looking at the planned route again and reviewing the possible performance numbers for a optimized Long-EZ, I think N6CG has a good chance of making it without an auxiliary tank. Plus, I like the idea of getting there on as little fuel as practical.
The following are the ideal range as each modification is incorporated as it relates to the goal.
It look like it will only take another 19nm of range to make the destination with a 20% reserve. Surely, another 1.7ktas of speed or 0.1gph less fuel flow can be found in two weeks. It may be easier said than done.