Up until Texas my average MPG was in the low 40's with this oil change. Prior, when I was using Motul V300, I'd get ~44MPG with 93 octane. A little less with 87 or 89 (odd, but that's how it worked out). With the Maxima Extra4 I have this change, I lost 1-3 MPG. Texas, well, eats gas. Probably because of 75 MPH speed limits and headwinds. I'm averaging 39 MPG no matter what octane I run: I lost about 2-3 MPG. I run a 1.5L Camelbak, which is nice, small, and doesn't get in the way. I have a larger one that can actually store stuff, but it can bang against whatever I have on the passenger seat. I try to remember to drink from it periodically, but often forget. If I'm enjoying the ride, I'll forget or skip lots of things.