I have not run 1/12 with the 1C, but in oval, I had to motor up to keep up. Even the weight difference was not enough. Went to a 13.5 on 1C and it is the same as the 17.5 4 cell. I could see that in time the 13.5 will be faster. The 1C did not seem to drop off as fast for lap times as the 17.5 4 cell. In fact I see no drop off in 5 min while the 4 cell do if their batteries are not fresh.

John