Summer / winter blend gas

[Gator]

Is there two different recipes? I've heard these terms for years, never knew for sure if there was anything to it.

I do know my fuel mileage changes with the seasons. I drive the same vehicle, the same way, over the same roads, repeatedly.

Fall, early winter, mileage drops 1-1/2 to 2. My most recent two tanks, it's back up.

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[pikepole20]

I believe the winter blend has about 5% more ethanol in it. Ethanol has less energy in it so it takes more of it to move the vehicle the same distance. Supposedly less pollution, but you are using more fuel to do the same thing. If I am wrong someone will correct this. Just more government BS in my opinion.

 

[JoeAz]

As a mechanic my understanding is it’s partly about volatility. The same fuel that starts easy and idles clean on a cold engine 30 degrees or so would evaporate immediately on a hot restart in 95 degree weather causing a hard start. So higher volatility in cold weather, lower volatility in hot weather is one aspect of fuel blends

 

[LeeMajors]

There is a difference. In the industry it's labeled as 7.8 and 9.0.
Supposedly Where it is sold depends on location. The original intent Iis the difference the vapor it emits dependent on outside temperature.

 

[Timfoilhat]

I know some areas get their own blend. Chicago had one. It meant the gas getting shipped there was more expensive. There's no reason why Chicago couldn't use the same blend Indiana used, except politics and money.

Why Gas Is So Expensive During the Summer (And Especially in Chicago)

Every summer, gas prices go up. It's not just demand. Gas, like clothing, has to get lighter as temperatures rise, to prevent not just pollution but vapor lock. It's even pricier here in Chicago, one of America's

www.chicagomag.com

 

[JoeAz]

there was winter and summer blends in Arizona