I think they change the volatility levels of gas about 5x per year up here. Not sure what they do with diesel.
I was having an issue for about a week or two where there was some hesitation from an idle to moving. WT?, go online and check it out. Ton's of dollars involved for the fix, but it really was scraping the bottom of the tank at the gas station when I filled up. Ran it thru, and all is well.
