Electric wheelchairs typically go 3-4 mph. They are not a replacement for point-to-point transit. My area also swings from -5f in the winter to +105f in the summer, so anything that's not climate controlled is quite unpleasant.
I think an electric wheelchair makes perfect sense when compared to walking, and using public transport. There are small foldable ones that can fit in a taxi or Uber as well.
