Yesterday was the first ride I did with a close friend on his 2012 GL1800. I actually lead and we were on both 2 lane highways & Interstate. I lead a fairly spirted 193 mile ride before my friends low fuel light nessicaited filling both bikes. Here is where I was surprised he held excalley 1 gal more fuel ! It figured 38.7 for my F6 and 31.6 for the GL. Actually I was really surprised my bike did this good with the wind yesterday and running 75-78 mph on the interstate. The only thing I can figure is he has the stock windshield on his GL and it is all the way to the top stop. He is 6'4" and it looks like a sail his windshield. My F6 has the 13" Cee Bailey with the vent and Baker Wings below the mirrors which were open. You guys here have any similar results.