Don't fret about doing the miles, keep the bike for ten years, save a fortune in fuel costs, at that age it won't be worth much anyway so keep it for the winter hack and buy a new bike, now you also have the beginning of you bike collection, when your second bike is ten years old, rebuild the first as it's now almost a classic and will start to gain value. By the time you are too old to ride, your collection can be sold off to fund coach trips to the sea side.