Trying to figure out what my MPG should be

I use B every day
I have a sharp decent off about 4-5 miles and the B mode does the job of slowing down the car very nicely. It works like putting a 4 gear Automatic in 3

 

Are you watching your daily MPG, or each-direction MPG? (Please see the last half of my first reply, which was added after you first read that post.)

 

You have two trip MPG meters. While getting accustomed to this new car, make a habit of resetting one of the them when starting the car each morning, or even each direction of your commute, so you can get faster mpg feedback. This helps to refine your driving habits faster. The MPG reading will start out pitifully low, even single digits, as the car warms up, but this doesn't matter. The number will increase throughout the commute (except maybe during the 75 mph section), and should reach its maximum at your destination. This is the number that matters. And you may find that wind causes one direction of the commute to read much different than the other.

And don't cheat by waiting a minute or two after starting to reset the trip meter. Well, you can, and it will read much better this way, but the results will never be comparable to the readings from truly cold starts.

 

I routinely drive the Kansas Turnpike well below 75 mph and have yet to be run over or even threatened. Try 74 mph, and if you survive, consider trying 73 mph, and so on. I would be disappointed with less than 60 mpg on your commute in summer and less than 55 mpg in winter. (Exception = head winds) Never tailgate, but find a slower truck to pace well behind, then traffic accepts you better since it is ok for a truck to go slow.

My trips from Wichita to Lawrence (usually through Ottawa) tend to net 55 to 59 mpg, but have been in low 40's versus a 30+ mph headwind.

Save B mode for descending from the Eisenhower Tunnel.

 

Yeah, my wife & I joke that we will take vacations based on wind direction, always taking the road with a tail wind.