I wouldn't up the sugar although it will not freeze as fast.
It is said that they gauge their distant by their drink if they are buzzzzzzzzzzing from a quick sugar rush they will over estimate their distance and if there is no "food" or feeders (sugar water) out for them along their travel they will expire.
White Sugar water is to get them to the bugs, perching will allow them to rest and store some energy thus may be allowing them further distance.
You can research to find out about the water sugar ratio change. All that I have read,(mostly books) clearly state not to. One may find a site that says it is ok but I go with the majority just to be safe. Don’t want a hummer's life on my conscience!
I have read much on the fluid colors, it is said that the premix isn't suggested. No honey of any kind for any reason. It is also said to cause a bacteria in their tongues and throat and / or tumor.
I have been watching them to see if color does lore them and.. Although I found them on several reds (plants) I saw them on yellows and several other colors.
And. my feeders are faded and they still come for their day long sips.
I know it does look nice..red water hanging there; but. if it isn't helping the birds, I simply don't care how cool or pretty my feeders are as long and they are clean and fresh for the little hummers..
I had an acquaintance that thinks she can just mix and do whatever she wants, claims the birds go there to drink.
Just my 2cents..
Jump in you Hummer watchers!
What are your thoughts on this?
Kale