2-24-2023 On my 2013 Chevy
2-24-2023 On my 2013 Chevy Volt, one more benefit of Mountain Mode is that, for the second time, once about 70,000 miles and now in 136,000 miles, my charger port has stopped functioning. Got wet in the rain. I am still able to charge using gas and MM and still get 35 mpg in town, 31 mpg city and up to 40mpg highway. I always use Mountain Mode except for short trips because the car gets 20mpg while charging itself so this uses more gas. Also, the tank is only 9 gallons so I only get a total of about 200 miles on 8 gallons. The charge port is now not available for 4 months {suppply issues} so Chevy cannot repair it until May, maybe. Bummer, but I can drive it and my other car gets only 19, 22 or up to 26mpg so I am still happy to drive the Volt on gas verses not at all. I am also retired so driving on gas isn't so big a deal, Even here in California where super is over $5.50 a gallon these days. Still, my lifetime mpg has dropped from 220 to 155 but the car is not sitting in a lot waiting, it is being used properly. Everything else is working properly.