I pulled into a Sinclair station to fill my Duramax diesel. Their price was about $.20 cheaper than the other places in town. As I was pumping the fuel I saw 2 stcikers on the pump. One was the normal stciker about the fuel being ultra low sulfar. The other sticker said the fuel was G Diesel and touted it as the cleanest burning diesel. Never having heard of G Diesel I went home and Googled it. I found some information that said G Diesel is 2 parts diesel mixed with 1 part methane. The manufature claims it burns cleaner and is more powerful. To me it sounds like G Diesel burns hotter and might not be good for my engine. Does anyone have any information on G Diesel? Has it been tested or just trown on the market?