Any of it with ethanol is horrible. Although it is more expensive, I have gone to 100% gasoline from a local station. I can tell the difference in how the truck runs ans can honestly see a difference in mileage.
Stuff is brutal on the Mikuni carb on my chopper. When I park it for the day I always turn the petcock off and run it til it stalls. Last needle/seat I put lasted about 5500 miles...
