Kansas Runners

For those of you who do not know who I am, I am a 19 year old former high school runner who is planning on doing his first marathon in late September. I have already built my base up to around 70 miles in a week and have extended long runs to 10 or 11 miles for 2 months. I was wondering if any people familiar with this distance had additional tips. I plan on building my base a bit and doing one or two runs of at least 20 miles since my longest ever is 15. I have raced two half marathons, cramping in one from dehydration and running 1:17 high for the second. Any advice would be appreciated.

@lionccrunner First, practice your fluid or food intake on almost every long run. This, I think, is a critical part of the marathon. From what I have read you need to fuel up early (within the first 30 to 45 minutes) and often. Whether that be through PowerAde, Gu, or Sports Beans is up to you. Also, do not neglect speed. Whether you log tempos, cruise intervals, or thresholds it doesn't matter just get some speed. In addition, don't add mileage just because "you need it". Remember the saying "quality over quanity". With that said, you are running a marathon and therefore going to need to put a good amount of mileage. Phew, well if you have any more specific questions post away!