Had it done on our 2016 Volt on Jan. 26th. Range if anything may have increased as well as gas mpg when running on the gas engine.
Yesterday with dry roads and 49-57 degree temps, I obtained nearly 64 miles on electric and 53.8 mpg on gas for a 126 mile round trip I drove to go fishing in Tillamook Oregon for steelhead. At this point it sure looks like, if anything, the gas mpg's when running on gas has improved, and looks promising. I'm pretty sure the same trip and weather conditions the results would have been maybe 55-60 miles on electric and 47-49 mpg just on gas.
Did the recall on the 20th of January, there has been no lost or improvement on the range. The only thing that has improved it is now very hard to tell when the engine comes on after the battery has been depleted. It is seamless. Just love this car.
I have also noticed after the recall was performed the engine will run hard for about 5-10 seconds and then wind down so you can hardly hear it. Sometime I can hardly tell when the engine is running. Also I did a test yesterday when I came into Astoria Oregon on the east side I ran for over 3 miles just on electric at about 30 mph, this is with the battery depleted 10 miles earlier. The engine fired up again as I left the city when I began to drive at highway speeds. The engine ran hard for a few seconds then calmed down. Returned over 54.8 mpg for 33 miles on the gas engine. Seems like a noticeable improvement to me especially with winter temps...
Over the last three days I used the Volt to go fishing, no luck, but gave it a good try. Looks like the recall did increase mpg's on the gas engine. I averaged 54.14 mpg, used 3.45 gallons, gas miles, 186.8. Also electric miles 203.7. This is with winter temps in 40-57 degrees max. Summer temps, with summer formulated gas would have probably been in the high 50's mpg. I am a conservative driver but drive the speed limit. Mainly mixed highway driving via Highway 101, on the coast...
Looking at the stats, voltstats.net, during the summer we averaged mid to high 40's mpg.
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