I would bet that if a standard hybrid 2016 Prius would have taken the same trip at the same speeds etc. probably would not have achieved over 50 mpg on gas. The Gen 2 Volt's gasoline engine, like I have stated several times, is more efficient that most people give it credit for. We have both a 2010 Prius and a 2016 Volt Premier. The last two trips just on gas for over 140 miles was a little over 59 mpg, cs mode. Our 2010 Prius would have attained about 55 mpg for the same trip, load, speeds, etc.