I got my 83 venture the 4th of July. After running a couple of tanks with sea foam in it I was getting 40 mpg. Now getting 37 mpg or a little less, I thought I might be running into some problems. Looking into a few things my problem is self inflickted. The more I ride the more comfort I have in the bike. So my driving a little harder and faster is more then likly the problem. Things are not as they seam.