Pointless having a car if all you do is 20miles a week,
Is it? Its all I need. I only use it if I need to carry something (model planes to the field, gardening stuff, etc) that I cant do any other way. So its essential, but not often. And never in winter unless to a hospital/doctor or something.
I have often weeks or months of non use in winter. Avoids the salt, too damned cold for anything fun, and I am surrounded by warm pubs etc. And I do 40 or 60 miles a week in summer. Odd trip to airport, mobility show etc. I am a very fair (warm weather) weather person. I hate the cold. I have to walk the dog miles in winter regardless, which I hate!
But my chairs get me about most of the time perfectly fine!
http://www.wheelchairdriver.com/images-beach/ Took the dog to the beach yesterday. It was sunny, warm, about 4pm, and as you will see its absolutely packed with tourists...
Also picture of the van I went in. And if you look close you will see its clean and has a few rain spots

You will also note that its tidal. And the sea is missing!