Cost for 168.6 mile trip / Volt 2 vs 2010 Prius Yesterday my wife and I went to Portland Oregon to go shopping with our 2016 Volt. Miles driven round trip, 168.6 miles, electric used: 57 miles / used 13.6 KWH, had 3 miles left on gauge when we returned home. Miles driven on gas, 111.6, with 2.18 gal's used for 51.0 mpg indicated on gauge. Total cost for trip ($7.22), with gas at $2.499/ gal, and electric @ .114/ KWH, 15.5 KWH X .114 =$1.77 (includes charging losses) Now we could have taken our 2010 Prius 168.6 @ 52 mpg= 3.24 gal's used for $8.10 for trip. Volt savings: $.88 = a savings of nearly 11% in fuel cost. This is not an easy trip as we leave at sea level via Highway 26 with 3 mountain passes, 6 in total for round trip, with the highest @ 1642 feet. For the trip I use Hold Mode on Highway 26, and on the way back just prior to the passes I engaged normal / electric mode to equal out the climbing. 3 passes on gas engine and 3 passes back on electric power. Highway speeds and some city driving, 55 - 62 mph. Temps ranged from 55 to a high of 70 in Portland area with dry roads. I can't remember if anybody has done a comparison (Volt vs Prius) for a trip like this with everything being equal as much as possible.