I agree with F350-6, I have been running B10 from my local automated station. I take an occasional trip to the mountains where I have to fill up with regular ULSD and I DO notice a big difference. At first I thought it was my imagination, but my buddy that was riding with me agreed it didn't seem to run as good. I first noticed it when I was pulling a long hill with a trailer full of quads. Got me nervous at first as I thought she was taking a crap, and I was a long way from home!