Painted the tins, now the fuel economy stinks
I need some help from the gurus, because I am just lost with this. I decided to paint the tins (fenders, side covers, tank). I took all the tins off, painted, re-attached, and started it to go for a ride. It ran a bit rough for about 10 seconds, like when the battery is not giving out enough voltage, but then smoothed out. (New battery BTW, so knew that was not an issue). It was getting dark, so I could not see very well, but as I started to walk away to get my gear, I noticed slight clouds of smoke appearing the the beam of the headlight. The bike was running ok, and the clouds dissipated, so I thought no more about it. Ever since then, it seems to be down on power a little, but most perceptible is the fuel economy is way down.
I ride the interstates a fair amount commuting to work, and I generally was getting 200-210 miles on a tank, not using reserve. I am now lucky to get 125. I have made sure it is not gauge error as it still takes the same amount of fuel to fill it. The carbs have been cleaned and synched, and plugs are 3 months old and gapped correctly. (Roughly 1000 miles on them).
When I painted the tins, specifically the tank, I only disconnected the front and rear fuel lines and front carb vent line from the petcock valve. I did take all the hardware off the tank (filler cover and petcock) and drained all the gas. The filler neck was stuffed tightly with newspaper so no debris or residue would get into the tank, and it was off the bike and drained for 2 days, so there was little to no rust formation. Air filters are new. It is currently at the shop, where it has been for two weeks, and they have not touched it, presumably because they don't know either and are working on things they can get in and out of the shop and make some money. But I really miss my Vulcan and want to get her fixed. So please, post any ideas or things I may have missed so I can ride the open roads again.