First off, not sure if this is the right forum for this topic....feel free to move. Anyway, ever since the Boston area switched over to e10, 10% ethanol feul, my milage in my 04 sentra has dropped, a lot. Everything I've read says that MPG with E10 shouldn't go down more than 2% or so, which is like 1-2 mpg. I used to average 30-32 mpg driving around boston, but now I'm getting 24-28 at best. Could just be a coincidence, but what has everyone else experienced with E10 fuel? My gf told me the other day her car has been getting worse mileage too, and she knows nothing about cars or E10 fuel, so it isn't just me. Maybe I just need some sea foam, car does have 40k on it now.