Your numbers sound right on the money. I often take a 200-mile round-trip from San Jose to Napa and back on weekends. Driving with cruise set to 76 most of the time, my 2016 tends to get 36 or 37 MPG. Same as the Gen 1, but regular gasoline. The Gen 1 seemed a tiny bit more efficient at highway speeds.I drive 57 miles a day on the generator. That's the other half of my round trip commute for work. Cruise control set at 74mph no traffic but an overall elevation gain of just under 1,400'. I'm using 1.7 gallons in 57 miles. If I drop it to 72mph I use 1.5 gallons. 70mph uses 1.3 gallons.
This is night time driving with the heater set on Eco at 74*, and the stereo cranking.
I was hoping for better, but it is what it is.
Generally between 44-49 depending on terrain, driving at 65-70 with AC on.I'm curious what kind of mileage you're getting for your Gen2 Volts when in Hold mode for highway driving for extended periods? I'm assuming you're driving between, say, 55 MPH and up to the speed limit.