If you're playing RW 1.1, Burn It For Fuel will now ask you to also install the Harmony mod. You might find it odd, since it used to work just fine without it, right? Well, not quite. I'm going to tell you a secret: if you play with mods, you already use Harmony. Search your Steam folder for 0harmony.dll and you'll find out all the cool kids depend on Harmony for their mods to work. Burn It For Fuel does too. The thing is, until now, everybody needed to bundle their own copy within the mod. Despite the disk space wasted on this, it was fine, as each mod kept it to itself. But this has changed with Rimworld 1.1! Now, if two mods use different Harmony versions, it causes a conflict they can't solve by themselves. So, we could do our best to keep our hamony version up-to-date and cross fingers everybody did the same OR we could just remove our copy and let the Harmony devs do the heavy lifting. We find the latter to make much more sense, so that's what we're going for. I apologize in advance for any inconveniences it might cause, but in the end this will be the best for devs and players alike. You can read more about the issue here