Because I also usually do my own maintenance, at least in the warmer 3 seasons, I usually still shoot for the 3000-mile mark, knowing that by the time I manage to get to it, the mileage will actually be around 5000 miles.
Years ago when I actually adhered to the 3000 mile oil change I had a tenant who would take the used oil from me and pour it into his really crappy car which burned about a quart per trip. It worked out great because I didn’t have to worry about disposing of the used oil.

One old wives tale I remember hearing around the garage was the statement "You can’t mix synthetic oil with regular oil." Apparently this is not true as some companies sell a mixture of the two motor oil types as one of their products.