KitKat-
The race is on July 13th in RI so it will be hot and humid but the race starts at 6am. Haven't trained with the infinit yeat but all the gels yes. gels go down easy for me.
-Mat

Don't know sweat rate; not a heavy sweater.
Did a 1/2 marathon recently and did it around 1:44 min
Bike not 100% sure a little slower on the bike; never timed the 56 miles before
Temp will probably be around 70ish-low 80s on bike and high 70's-mid 80's on run. New England weather is nuts

I think you're OK on the run as long as you are drinking enough water with those gels. I like to do 2 gels during an HIM and rely on sports drink on the course, but 4 gels gets you roughly the same number of cals and should be plenty of energy for a sub 2:00 half mary.

On the bike, test that Infinit this weekend to make sure you can stomach it.

People sweat more than they think on bike rides because the air evaportes the sweat much faster. Assuming you are biking in the 2:30 to 3:00 bike range, you may be just a touch low on fluids and a touch light on calories. I think Inifinit says to start at 24 oz/hr. I go closer to 40 oz an hour or more in hot humid weather, but I am a heavy sweater. I'd say take 1 more gel and leave room in your plan to grab a bottle of water at an aid station and top off your aerobottle later in the ride. Consider taking an endurolyte or 2 after you've gone through the infinit if it is really humid.

It should go without saying, but because of one recent thread I'll say it: be sure to thank the volunteers and don't curse them out if a bottle needs to be opened on the fly :)

Prerace shoudl be about 400 calories. I think you have more.

You have 450 calories listed for the bike. You need 240-280 calories an hour... you're short unless you're doing it in two hours.

It's tough to eat on the run, 4 gels with 8oz water each will get you through but still short. With a 1:44 half marathon, you're looking at a 2:00 half IM half marathon.

I hope my numbers are right... I'm rushing out...

Where are you getting your numbers? Who says 400 kcal pre race? And 300 kcal of infinite and 3 gels = 570-630 kcal on the bike. Where does 450 come from?

Sounds like your set then. I would probably pack an extra gel or two in your tri suit "just in case" you have an energy drop. Are you still going to take the infinite? (please say no) If so do you know how much sodium it has? Also remember what may have worked on a hald marathon may not work on a half marathon after a 56 mile bike ride, the body changes needs. I'm sure you've done long bricks....so go again, go with what your body knows on like training.

Where are you getting your numbers? Who says 400 kcal pre race? And 300 kcal of infinite and 3 gels = 570-630 kcal on the bike. Where does 450 come from?