I haven't shot with other gear than my designated SIJ gear (EM1, 25 1.2). It feel that helps in seeing the limitations and opportunities the "one camera, one lens" routine faces you with, especially since I selected a fixed focal length. That said, this is a focal length I've spent 20 years with without complaining (I used to shoot with just a film SLR and fast normal 50). It's the digital age that spoiled me with options, and somehow it feels great to have a period of limitations. Sometimes I do sit down behind my desk and take out my usual daily gear (Pen-F and small primes), and I'm amazed at how light it feels compared to the EM1 and the large 25 1.2.
I did think hard about a theme this year, since I hoped this would help me in staying on track, and I tried to pick a theme that fitted the selected gear. So far it all works as planned. I just switched from SOOC JPEG to RAW. My theme does ask for geometrical corrections sometimes, and I find the RAW images just give me more latitude and result in a more pleasing look. So far I have photographed 19 filling stations, only 11 more and one collage to go.
On another note, this month so far did not cure me of gas. The 25 did show me how versatile a focal length the 25 gives me, and I am thinking that I could add the 12-100 f4 to my stable, in order to have a two camera / two lens travelling solution (EM1 with 12-100 / Pen-F with 25 1.2), where I also have a gear failing solution. Thing is, I also have the 12-40 and 40-150, which I think I'd prefer for most other scenarios. An expensive 12-100 just for travelling leaves me pondering. And what about that 7-14, wouldn't that give some new perspectives to my photography? And what about.... It never stops.