I filled up a couple days ago with E10 (98 RON/93 AKI) instead of the usual ethanol-free. Suburban fuel consumption is up by ca. 5% to 7,6 l/100km against the usual 7,2 l/100km since then. The link is clickable with all sorts of data, but the trend shows.
What slightly irritates me about my car is that no matter where I drive, or how I drive it, it seems to land smack around the same average. Yes, there are some outliers caused by timing (i.e, doing a fill up after going down the mountains). Autoroute? 7,2. Suburban? maybe around 7,3. I mean, what's the point of getting a car that can't do better?