I agree with ending them on Sunday. If I have a chance to end mine on Sunday, I always do. It's even easier to do now that you can choose what day and what time to start your auction, and even arrange a 10 day auction if you must to have it end on Sunday.
I also NEVER sell during the summer. I start selling in December and quit when I run out of stuff, or about March what ever comes first. It's been my experience that during the summer, we are all out hunting the back roads, doing shows, hiting auctions etc. and the last place we want to be is on the computer.
During the winter, many of us can't get out of the house, there are no outdoor shows, and the auction season doesn't start until spring. so.... we spend more time on the computer, and thus more buyers.
Hey, I live by this. During the summer I can actually get a few 'deals". During the winter, there are too many guys "hunting" on the web. However, with the different sniping sites being used now, getting a deal is getting harder.
My two cents..........

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Don "oltoydoc" Sherwood
Vintage Gas
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Don "oltoydoc" Sherwood
oltoydoc@vintagegas.com
(310)415-9562 Cel.
Vintage Gas