I picked a 2017 Volt because my 2015 Leaf was unable to meet travel requirements for my job. Having driven a Leaf for 2 and half years, I was very familiar with the whole EV experience. What I wasn't prepared for was the high speed fuel efficiency. I assumed the Volts 42 mpg EPA rating was determined by putting the car on cruise control at 65 mph over a long distance. Experience has taught me fuel efficiency drops off a cliff after 65 mph in most cars. In the first month I had the Volt, I put 3,058 miles on it, mostly 140+ mile highway trips driving at sustained speeds between 75 -78 mph. I used the cruise heavily and got 39 mpg on the hilly trips and 41 mpg on the flat ones. These numbers are after factoring out any electric miles. On top of that, if I had to pass a truck while doing 75 I would punch it at the car would accelerate quite impressively. I am sure a Prius would get better MPG at that speed, but it definitely lose more than 1-3 mpg over its EPA rate mpg, and it sure as heck wouldn't have the passing power. This got me wondering, does anybody have data on steady speed mpg for the second gen Volts in gas-hybrid mode?