Acceptable oil use

Just finished servicing my bike after the ride to Sturgis and through some beautiful country. My bike ran great and I averaged around 43-45 mpg. I spent the winter working on the carb and installing the kit I found on this forum to get rid of the coughing through the carb. I am a happy camper now. I did use some oil though. My question is how much oil use is an acceptable amount. I think I put in two quarts in about 4000 miles. No smoke unless I reall got on it. Should I be concerned?............Thx Bob
No oil coming out the air cleaner and no extra oil in tranny or chaincase.
98 wide glide 43k on motor

Both plugs look great. Slight dark tan/grey with no oil residue. Irridium plugs with amsoil that is usually changed at 2000 miles. On this trip I changed before I left and again when I got home. I decided that since I was adding oil and I was using an amsoil filter I would be ok with the longer change interval with all highway miles. I always put on a new filter with each oil change. I am going to try the 1/2 quart low theory and see what happens. Not to concerned though because I always check my oil at the beginning of the days ride.............Bob

Check your plugs, if they have the tell tale black crap on them then it is burning oil, I am on the other end of the spectrum, I dont think two quarts for 4000 miles is that much, that is only a quart for 2000 miles, I dont think I would lose any sleep over it, Air cooled engines will use some oil especially with the sever riding conditions at Sturgis stop and go traffice extended idling and hilly curvy roads such as iron mountain or neeles highway, constantly up shifting and downshifting. All th bikes I was with also used some oil when we were out there especially the evo. Todd