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Ehh…
Interesting, but since the study was primarily a tag along survey to detecting COVID, I wonder if they controlled for folks who were on SSRI’s, and if the distribution of participants was across the equator, or primarily in areas of the world that experienced summer during the survey period (March-Oct, 2020).
It’s known that SSRI’s contribute to a heat intolerance that is typically more noticeable during summer months. It’s described as feeling warmer, and is accompanied (sometimes) by decreased production of sweat.
Heat Intolerance and Psychiatric Medications - Psychology Today
That’s not to say there may be some (or a lot, even) merit to this study, but I’m curious about those two issues - if they had been controlled for.
There’s a difference between summer and winter fuel for gasoline engines in some areas. It’s usually to do with smog restrictions.
The same octane can be reached with different blends of hydrocarbons. So instead of just ‘pure’ gasoline to hit a desired octane, refineries can mix together higher and lower octane fuels to reach the same overall octane rating. This increases the amount of refinery products that can be used to blend gasoline, so it can be made more cheaply. The trade off is that it’s less pure, and most importantly for this comment - that some components of of these cheaper blends may evaporate more readily, leading to smog.
In summer, when it’s warmer, some areas mandate gasoline must meet certain standards for evaporation. In winter, those standards are decreased, because it’s cooler.
Ethanol has a relatively low evaporation point. I don’t know the specifics of the commenter’s location, but I could see ‘summer gas’ having no ethanol to meet these standards.
More info: The Vapor Rub: Summer versus Winter Gasoline Explained — Car and Driver