Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
SkinnedKnuckles
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Anyone know when the switch from Winter to Sumer blends occurs? I seem to think it's around May 1st, but can't find anything on it. I'm putting off tuning the carbs until around then....
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Summer Gasoline Blends
- Thread starter SkinnedKnuckles
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TR3driver
Great Pumpkin - R.I.P
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According to https://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/summer-fuel.htm/printable refineries and terminals have to switch between April 1 & May 1; while stations have until June 1 to continue selling 'winter' blend.
OP
SkinnedKnuckles
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Hey - good article. I'd heard the reason for the switch was to make winter starts easier. Must be spin. Glad the May 1 wasn't imagination.
TR3driver
Great Pumpkin - R.I.P
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That would be in "propane" aka LPG (liquefied petroleum gas), not "gasoline". And they do put butane in the propane (although I'm not sure about 40%) in areas where it gets below about -30F, to keep the vapor pressure up. Propane remains a liquid at -44F.TRED said: