Scratch that - it definitely has a 1x icon. I saw it for myself today.
Yes I have seen it also, and I do concur that this is what kills the battery. I believe 1x and 3G ARE ran at the sametime, because 3G is only used for data, and voice/sms are not 3G. At least I'm pretty sure they're not as with my old LG Voyager when I was in my house with 3-5 bars for 3G (EVDO) but 0-1 bars for 1x it would take time for a good enough signal to send texts/calls to connect. However if I went somewhere where my 3G signal was non-existent but I had plenty of 1x bars I could send texts or make calls instantly. So I am almost positive 99.999% that both 1x and 3G are active at all times, and are relied upon for total system usage.
However since 3G is the primary data network on a smartphone it is only necessary to show this signal at all times. Here's something to try though:
1: Check your 3G signal and make either a mental or paper note of your bars
2: Dial a number to whomever, and watch the signal reception/data network icon
3: They should change to no 3G icon and you may see a difference in bars.
I have tested this with my girlfriends and my Droid X sitting side by side and each time the number of bars changes to reflect the difference in signal from 1x to 3G and vice versa, and the icon for 3G is dropped, which imo is a clear indication that networks are being changed. I wish there was a way to display the signal from both networks simultaneously as since common features rely upon it it helps to have a clear reason why your texts or phone calls may not be going through...
But back onto the topic of battery life, yes this had MAJOR affects on my LG Voyager Titaniums battery life. Once I left my house and was in an area where I had ample 1x and 3G signal my battery held charge well. Walk into my houses 1x dead-zone, battery could drain in a few hours. I think this is a definite fault of quickly draining batteries and will go down on record as stating that this phone DOES have exceptional battery life. You must factor in outside variables such as this signal issue which affects all phones, and is not a flaw in the Droid X's circuitry. Just my 2?