A recent thread got me thinking about the additional cross ectional area imparted to the DR650 by a windshield added on, and that of course led to questions on the impact to mileage. I'm not one to be overly concerned with squeezing every Joule of energy from my gasoline and tranferring it directly to the pavement, but I'll take what I can get if its not much of inconvenience. With that in mind, if I'm on a predictably long, straight, road, I tend to sit far back on the saddle (meaning nearly sitting on the rear fender) and leaning far forward on the bike to get better aerodynamics, sometimes resting my chin on my left hand, the elbow of which is resting on my left knee. As you imagine, it's hard to tell accurately without a scientific series of measurements, but I believe just doing this alone nets a further 4 mph or so under the same throttle load. My back or neck can get sore after a while, but normally not before my ass does, since I still have the stock seat. I'm no expert on the subject, but I know that fluid dynamics is a funny subject more akin to art than science, and I wouldn't be surprised if a windshield might actually help mileage by providing a more directed and stable airflow around the vehicle/rider. So have any of you noticed a substantial change in mileage after the addition of a windshield? Or is it without discernable impact at all?

I get better gm with the windscreen. No doubt about it. I am almost back to stock numbers after all the rejet/repipe mods I've done.