Hi Ralph,

Yeah, I understand what you are saying about the nitro, and you are right. A drop in rpm when removing the glow plug means an engine could use either a higher compression ratio, or more nitro. The problem with trying the 15/18 fuel for a test however, is that the issue is "muddied" by the extra 8 percent oil lowering the methanol content, which I believe is almost as low as it dare be for reliable glow operation already.

AV8TOR