I would run the 19L tank and then bring another 1/2-1 gal via MSR bottles in a tail bag. We used the motojavi from giant loop and it worked great. You might also end up getting a splash of fuel from some folks at the start of a stage once their rider is through and though would be helpful too. Gilky's crew gave me a splash on the start of the last day and it saved me from having to stop and use my spare gas. I would plan on doing most of your eating in the morning and carrying 2-3l of water and energy bars for a mid-day break during a transfer. Not going to be time to stop for ceviche for lunch! No night riding unless something goes really wrong. At that point you aren't racing anymore since you maxed out the times and I would just take it easy wit the stock light and leave the helmet light at home.