I have a 2000 650L and am not sure which plug I should be using. I ride both on/off road. Typically I will run 2-3 hours at highway speeds to get to where I will be riding Forest Service gravel and dirt at 15-30 mph. My Owners Manual recommends one plug as standard, one as cold weather, and one for extended high speed. Also, I only get about 35 mpg. Any thoughts, suggestions? Oh yeah, keep it simple because I am a technilogical idiot.