[beatr911]

If you are unsure which is better, please test three tanks of fuel with each set-up. Oh, and don't change anything else during those 6 tanks. Good testing takes time and conditions that isolate the change you are testing.

My guess, and that is all it is, is that the flatter the windshield the better for fuel efficiency. Taking it off MAY be even better.

You could also install flat "drag" handlebars. These also give you the possibility to cut them narrower than your existing bars further reducing drag. Alternately, install your handlebars upside down so that the rise of the bar results in a drop. You will need to install them backwards as well so that the sweep is backward. If you don't run into clearance issues, it will put your hands in about the same position as clip-ons.

Also consider cutting the seat foam down to as low as you can go. This reduces your frontal area a little.

Make only one change at a time and test 2 or 3 tanks to see if it makes a difference. If it doesn't, you now have the option of reverting back to stock with no penalty. Be careful and patient, this is not a sprint.