This is an odd one.
I've noted this here before, but my wife has sort of a heavy foot. She loves to hit the gas and brakes in equal amounts and no amount of coaching has ever made an impact on her. In general I don't ride with her as a passenger because... well, it drives me crazy (or at least crazier).
Last night she took me out for my birthday and we went on a route I'm quite familiar with, as I drive it three or four times a week. It's about 20 miles one day, with equal amounts of city/highway (highway at 60mph, city at 35mph). In either case she would drive the max plus five, but when I drive I generally stick to the limits. I also practice the very best braking/gas use (always at or near 100% braking and very slow starts and movements).
Under the current weather conditions (highs in the 80's) I'm getting mpg in the upper 50's to low 60's. Sometimes I get in the mid 60's, but I always think of it as a "perfect run" when that happens. Last night, driving to the restaurant, I got 58mpg, which wasn't great (I had some traffic issues and missed some lights). At the eatery I, well, let's say it was a celebration and I partook of some beverage which caused me to need a driver of better equilibrium. My wife, who had stuck to ice tea, drove home.
As she drove it was the usual hellish jackrabbit starts and pounding brakes finish, and we even got stuck for about 20 minutes for an accident (so just waiting there with the engine on -- it was battery power, thank goodness, but it used it all up). When we got home I couldn't wait to see how bad it was (and yet I knew I wouldn't say anything to her about it -- momma didn't raise no fool). She proudly announced "55mpg!" and I looked over there and that was indeed what it said (55.6 to be exact).
WTF?!? How did that happen? 20 miles of between 40 and 65 mph, with a 20 minute stand still delay and brake scores (I watched) of no better than 65% and the fastest acceleration the Max can do and still that? I, with my very careful driving, could manage no better than 3mpg better?
Now, to be fair, the trip TO is always worse than the trip home. Maybe it's slightly uphill (hard to tell in Florida). And part of that, I'm sure, is EV+ mode (when I get into the mid 60s it's nearly always on the trip back -- so perhaps I would have been at, say, 66 mpg). Still, 55mpg over 20 miles at those speeds with about the worst driving imaginable is pretty impressive, right?
I'm beginning to think now that trying to teach my wife how to drive better is a lost cause.