re: How many hummingbirds are y'all seeing?

OH, good idea. My parents have two of them and I've noticed they have a good bit of action.

Put my feeders out this afternoon and already have visitors.

Haven't seen any yet.....

4:1 water:sugar
Use hottest tap water (enough to dissolve it) and refrigerate it
Refill as needed - never max it out
Don't use red food coloring

I have been seeing at least one hummer a day this past week until I saw two today. The fights have begun.

I planted two Goldflame Honeysuckle plants to entice more of them.

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prothonotary warbler is building a nest in one and those little birds are just gorgeous. The brightest yellow.

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I saw one of these at my bird bath late last year. It was the prettiest bird I have ever seen in the wild.

They dropped off big time here in Broussard. We were getting 10 an hour. Now seeing about 10 a day. I suppose they moved on.

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What's the best sugar to water ratio for best results?

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Many sources will chant the 4 to 1 mantra, but this was fabricated by an activist who wanted to get people involved. Sadly, this man had only preliminary science behind this assertion and a bit of incorrect math was reputedly involved. The program took on a life of its own and will not die while defying actual science and math. The truth is that 3 to 1 is closer to the concentration of most of our flower nectar when measured with a refractometer.
Science should triumph over media rumors!

Here is a quick reference:
Three to one recipe.

Here is a scientific discussion which points out why giving too much water actually might be a bigger problem than too little:
Hummingbird kidney function and sucrose.

Here is a Louisiana resident scientist (Dennis Demcheck) who (as a hobby) took the time and trouble to scientifically measure the sucrose content of many of our flowers:
Nectar of garden flowers from Louisiana Ornithological Society - see starting page 7. The short answer is that if you insist on using 4 to 1 out of fear for their kidneys, then you should plow under most of your hummingbird gardens as equally dangerous.

And this is from Dr. Van Remsen (PhD) of LSU Ornithological Department who wanted people to understand how to measure and understand sucrose content. There is actually a high sucrose content salvia named for this man:
Understanding sucrose content.

I use 3 to 1 volumetric mix of water to plain white granulated sugar. Warm water works well to dissolve the solution - shaking or stirring helps.
Boiling only helps remove some chlorine, but may concentrate other minerals of concern - especially iron. I see no other purpose in boiling. You should know that the first hummingbird tongue to hit the nectar contaminates the reservoir, so it will not be sterile for more than a couple of minutes anyway.
Never use any dye - natural nectar is clear and the health effects of some dyes are unsure. Others are known to cause problems.

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How often do you change it out? Once a week?

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This truly depends on how hot it is outside. Sun speeds growth of mold and also fermentation. Most people figure 3 days is okay unless it gets really hot or in direct sun and then even shorter. Watch for any cloudiness or black spots. Mold is deadly for them. I mix up a batch and keep it in the refrigerator for up to two weeks.

Enjoy your birds!

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Fine to wait a week to change it out right now.

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We have 17 h-bird feeders and fill them about 1/3 - 1/2 full each day. They are drained daily. Each morning the little guys are perched on the shepherd's hook appearing to patiently beg for the refill.