Thanks for the replies. When I really thought about my run time, I realized that 6-8 hours is a huge exageration. It's probably closer to 1.5 hours. Interestingly, I've gone through at least 6 gallons of gas in that amount of time, again no load.
As I stated in a previous thread, i'm ready to pitch my injection system in the garbage. I've spent the better part of 18 months trying to get it right.
Maybe the cobra gods are trying to tell me something..