[SoldierDad]

Question? Why, if the summer blend is better for the environment, is there any need for a different blend in the other months of the year? I have a noticable increase in fuel efficiency with the summer blend over the winter blend. Having no need for a difference in blends might also drop the price.

[Alberta's Child]

Good question. That might vary by location across the U.S. My understanding is that the summer blend in the Northeast includes ethanol, which I think means fuel efficiency actually declines for most vehicles here in the summertime.