Thanks for the replies! It's good to hear tethering is working for some folks.
By reliably, I mean it kept dropping connection and now won't work at all. When I first got the Moto G, I went into the settings and enabled Portable Wi-Fi hotspot, gave it a name, and enabled WPA2 encryption with a good password. I then turned on my Samsung Chromebook and it quickly found the Moto G hotspot and prompted me for the password and connected. As soon as I opened the Chrome browser to go to a website, it gave an error about not being connected to the network. I tried rebooting both devices and had no luck. I then searched here and xda and found a post there suggesting changing the APN settings to fast.t-mobile.com. I did so and retried and the first time it worked great! Surfed the web for about 15-20 minutes, but then the Chromebook started getting 'not connected to the Internet' errors. I checked the Moto G and it had completely lost data connection to the cell network. I restarted both devices and they both worked again for about 15 minutes before the Chromebook started saying not connect to the Internet again. I found that just toggling airplane mode would allow me to continue for awhile, but that's still a hassle. For some reason now, the Chromebook won't connect at all - just redirects to the T-Mobile sign in page every time I try it. I was previously using the Ultimate User Agent Chrome extension to set the UA to Android and the poster at xda recommended a different Chrome Extension set to Firefox, but neither of those work either.
Conversely, as soon as I pull the SIM card out of the Moto G and reinsert it into my Nexus 4, both the Nexus 4 and the Chromebook tether just fine and I can browse the Internet for hours at a time - no errors, no interruptions, etc - it works flawlessly. In fact, I'm typing this response on the Chromebook tethered to the N4 right now. I tried setting the Moto G APN settings exactly the same as the Nexus 4 (the only difference was the MMSC entry), but that has not helped either. I was really hoping to replace my Nexus 4 with the Moto G, but I rely on tethering almost daily. Any additional suggestions would be greatly appreciated.
Thanks again!