Switching to summer blend fuels June 1 -Sept. 15.

gfh77665 said:
https://blog.amsoil.com/the-differe...etrack&subid=c5e5757f44a6e81190fd005056988f87

This is a good overview of how and why the US fuel supply makes seasonal changes.

Disclaimer: I do not sell any products. Its just for general interest only.
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The reason it has higher energy content is bacause the Butane is removed.
Which also means it doesn't evaporate as readily (good in summer, Bad in winter)

The reason that this is done is because it's an EPA rule to reduce air pollution by limiting evaporation.
 
JohnnyG said:
The reason it has higher energy content is bacause the Butane is removed.
Which also means it doesn't evaporate as readily (good in summer, Bad in winter)

The reason that this is done is because it's an EPA rule to reduce air pollution by limiting evaporation.
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That's correct. Seasonal blends have been mandated for many years.
 
Does the EPA's waiver allowing E15 fuel past June 1 have any effect on the data found in the referenced blog? Or are they two different things? Thank you
 
My old 2004 RAV4 did not like the seasonal change overs. My wife would complain every spring and fall that her baby was running rough. It would last a couple tankfuls and then settle down.
 
By 2004, the vehicles computer should have effortlessly adjusted, especially with a Honda, who had a stellar tech reputation back then.
 
Yup, I already switched to V-power as of Monday for my 2GR-FE. The EJ253 will have to wait, it still has about 3/4 of a tank.
 
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My OPE doesn't like winter blend E0 in warm weather. Vapor lock issues on the hot days until I use up the winter cans. It takes longer for the local gas stations to get replenished with summer gas also as demand doesn't increase until boating season kicks in.
 
I saw it in May here in VA. Clear as day on my catalogs. Big difference in my tuned VW between them. Winter blend much more susceptible to knock.
 
Even though our weather is colder here we usually get our summer blend around the middle of April here. I noticed it was a couple of weeks later this year though, my Civic gets a big 10% boost in MPG once the summer blend starts and the instant they switch back to the winter blend that 10% goes away again. My Corvette doesn’t seem to care that much either way though
 
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