Good guidelines, but bear in mind that both values are conditioning and heat dependent. If you aren't in condition and try to ride a long distance without downing some calories each hour, you'll "hit the wall", where you run out of available energy reserves. This is not fun. I did it twice - made it home without passing out, but slept through to the next day. To avoid this, figuring on consuming 100 calories each hour.

I did lead vehicle on a 100 mi bike rally in June where the lead riders did the whole ride without stopping on 2x 20oz bottles. They averaged about 20 mph. On the other hand, I did some 45 mi summer (107+ degree) rides through north Dallas where I burned through a 100oz camelbak 4 times in the course of the ride.

Just as an aside, I can't stress enough to leave that fashionable black clothing at home if you ride in hot summer temperatures. No reason to expose yourself to added heat stress. Also, I'd like to add that uninsulated camelbaks full of ice water are really comfortable when the temperatures reach up into the hundreds.