In my opinion, it is relative to speed. The faster you run, you will naturally begin to land on the mid to forefoot area. If you run at say 10 min mile pace, you will land on your heels. The problem comes when people 'try' to run a certain way. If you watch someone running at a slow pace and landing on their forefoot, it is imo the most rediculous thing ever. Young children naturally run with excellent form, they don't think or learn it, it is instinctive. Again imo, the key thing is for your foot to land directly underneath your hips. Speed will naturally dictate whether the heel, midfoot, or forefoot lands first.
Last year I had 8 HIgh5 caffeine gels in one water bottle, topped up with water (240mg caffeine, 184g carbs) and isotonic drink in the other. I swapped the iso drink bottle at each station, the one with gels in, I drank in stages (25, 50, 70, 90 miles approx.) so had a 60mg shot every hour and a bit. Flat coke for the run, plus a couple more caffeine gels near the end. Seemed to do the job quite well.
I had the same dilemma this morning. Wanted to do a four hour bike, but with the weather as it is, chose a 2 and a bit hours on the turbo. This time of the year, you are not going to be able to do every session planned due to weather, sickness etc. and you should factor this into your plan. The odd changed or missed session is not going to make any difference come race day. Intervals on the turbo is my advice. If you opt for 2hours on the turbo, you will do 2hours turbo. Head out the door tomorrow and take your chances what you get.
+1 for taking a caravan. Took mine to the Outlaw this year and it was perfect. No waiting for showers after race, can store/cook anything i want. Same again next year, plus going up on the Tuesday for the half and chill out for the days leading up. Just an idea, if funds allow, could you hire a motorhome for the weekend.