Does EFI cleaning helps with mileage?

[nookandcrannycar]

Originally Posted by Kaotic Lazagna

I do it (with 91 octane), don't know if it really helps. And in my car, summer blend and 91 octane, I actually get worse mpgs (opposite for winter blend. I do it once a month unless 91 is really expensive

My engine's compression is near new, get good mpg despite how my car is set up, engine doesn't make any weird sounds, etc.

Then again, I also use Seafoam once a year. LOL

We get about the same MPG, but you drive 55-75 and I drive 55-60. I thought, is it just re incorporating feedback that the Scan Gauge provides (I don't have a Scan Gauge)? Or are there other possible reasons? Then I saw this post and looked around on the Sea Foam website. I'm going to have to get some of that motor treatment!