Summer vs Winter blend - gas transition dates - 2019 Honda Insight Forum
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post #1 of 13 (permalink) Old 05-17-2019, 01:12 AM Thread Starter
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Summer vs Winter blend - gas transition dates

Anybody know when we will switch over to summer gas or has that already happen?

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Manufactured 9/2018, Bought 12/28/2018

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post #2 of 13 (permalink) Old 05-17-2019, 06:21 PM
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Anybody know when we will switch over to summer gas or has that already happen?
The transition varies by state based on weather/temperature differences of geography. However the core dates for summer gas (i.e. when everyone has it) are 6/1 thru 9/15 based on federal regulation. Warm weather states like California and Texas can sell summer gas as early as 4/1 and as late as 10/31, and some states like Arizona sell just a single blend year-round.

Summer blend has +2% energy value over winter blend, so you should expect to see at least that increase in mpg - aside from warm weather helping hybrid battery/mpg.

https://www.caranddriver.com/news/a1...ine-explained/
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post #3 of 13 (permalink) Old 09-06-2019, 01:50 PM Thread Starter
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Gas prices will likely decline even more substantially starting in mid-September as most of the nation begins the transition back to cheaper winter gasoline starting September 16. https://www.gasbuddy.com/go/party-at...-of-labor-day/
Seems like we will be switching to winter gas soon.

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post #4 of 13 (permalink) Old 10-24-2019, 12:34 PM
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I started trying to find the exact difference between winter blend fuels and summer blend (there are over 20 different blends in the USA at any given time).

Biggest things I've been able to confirm, winter blend has a lower evaporating point (generally represented in the form of RVP (Reid Vapor Pressure) rating.) Most winter blend fuels use simpler and lighter additives such as butane which is more volatile (affects RVP), but has less energy content than Octane. The additives in winter mix are generally cheaper, and require little maintenance to switch over from summer blend. This combined with less driving during winter months is why winter gas is cheaper.

Summer Blend gasoline generally contains heavier additives, to help reduce volatility. The major purpose of this is so that the gasoline doesn't evaporate before reaching the cylinder, preventing vapor lock, and reducing emissions. The additives for summer blend are harder to implement in the refinery process, so the gas companies tend to do their yearly maintenance at the same time as the fuel switch. The downtime, and more expensive additives are why every spring we see a spike in fuel prices.

The EPA estimates the energy content of Summer fuel is 1.7% greater than winter fuel, which has a small impact on fuel economy.

How Stuff Works, Fuel Blends

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post #5 of 13 (permalink) Old 10-24-2019, 09:54 PM
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There wasn’t a change this year for mid-Atlantic states, due to the Philadelphia refinery going kaboom in June.
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post #6 of 13 (permalink) Old 10-24-2019, 10:38 PM
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There wasn’t a change this year for mid-Atlantic states, due to the Philadelphia refinery going kaboom in June.
I'm in western NJ, and we have winter fuel.


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post #7 of 13 (permalink) Old 10-25-2019, 06:23 AM
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post #8 of 13 (permalink) Old 10-26-2019, 05:40 AM
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Wondering if you've seen one like this winter-to-summer detail that is more current than 2013 (assuming state laws may have changed since then?) and with summer-to-winter transition detail? My search for this on the EIA site turned up empty...
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post #9 of 13 (permalink) Old 10-26-2019, 04:17 PM
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It was more of there wasn’t summer blend this year so we have been technically on the winter fuel this summer.
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post #10 of 13 (permalink) Old 10-26-2019, 04:50 PM
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There wasn’t a change this year for mid-Atlantic states, due to the Philadelphia refinery going kaboom in June.
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It was more of there wasn’t summer blend this year so we have been technically on the winter fuel this summer.
Oh, bummer - so you've had "winter mpg" all year then. But it'd be an interesting comparison point...

Your summer fuel economy would have only benefitted from warmer temps, since winter gas was a constant factor. What mpg differences have you seen cooler temps vs warmer temps while on winter blend?
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