Original owner of:
1971 BMW R75/5
1984 Yamaha Venture
2002 Suzuki DR200 SE
I've gotten 51mpg riding the back roads from Jacksonville, FL to Savannah, GA on my 2006 HD Softtail. The best my CLC did riding the same route was 44mpg. I weigh 265lbs and do not expect to get the same mileage as much lighter riders. Comparing mpg among riders is like comparing apples and oranges. Ride Safe
Cave Contents: 1980 R100RT/Ural Sidecar, 2004 R1200CLC, 2006 HD FSXTI
the old adage was "10 lbs = 1 hp". (not sure how that compares as a %age of mpg, and its too early in the morning for my brain to want to do math- but its not like comparing suspension settings and handling characterstics across disparately sized riders.
Ride Safe, Ride Lots
My '07GSA1200 has a 10 gallon tank from factory, so the 8.something book data is wrong. My bike has had a fuel strip reader issue a few times, but once failed on me and I was not paying attention, ran her dry. I preceeded to put 10 gallons in the tank, an even 10g.... I had gone over 400 miles, but not recommended if you like riding, not walking. I too have heard the newer GSAs get better mpg's, NOT confirmed. MY best has been mid 40s range(riding very conservatively), worst, mid 30s for mpg's, running hard in Texas at 80+ mph all day. I have griped constantly about poor gas mileage(GSAs), so maybe BMW is listening. My only fear is having to buy another 22000$+ motorcycle to get it. I have promised myself the answer is NO in that regard, so replacing my GSA1200 with another is out. Smaller bike? Maybe! Randy PS; EVEN my OLD R100/7 gets the low 40s for mpg's and NOT my new fangled, everything latest BMW/GSA. Backwards technolgy in a way? Even the latest BMWs still surge ahead with MORE HP and I continue asking WHY! I like performance, but put some conservative gas usage in there somewhere on the "bigger 1200cc and up bikes" too. Just maybe someday, before I quit riding. I already know the RTs and KLTs do it right, with all that faired surface. GSAs, no smoothness about them, BUT? I hear talk about the new ones and gas! Maybe just talk or???? Randy, getting carried away
At 80mph, 2-up & loaded, my GS/A will go 360+ miles per tank.
Like Saddleman, I generally get 50 mpg on my 05 KLT, riding two up. Best was 52, worst 47. Generally count on stopping at around 270 miles, sometimes the light has just come on, sometimes no light.
Much of your problem with gas mileage has a lot to do with the simple fact that the GS and the GSA have horrible aerodynamics. The resulting air drag (parasitic drag in aircraft terms) causes you to use a lot of gas to push it through the air. Even the position and design of the windscreen will effect mileage. My RT computer shows about a 2-3mpg loss if I run the windscreen fully up as compared to fully down. The large top case is worth about 3-5 mph unless there is something sitting in the passenger seat to fill in the gap behind me.
The other problem is that as a general rule, to double speed uses about four times the energy: you need a bunch of HP to push the beast faster and faster resulting in much more fuel consumption and way less gas mileage.
Running fast on a big fat heavy bike with square bags uses a lot more gas compared with something like the RT which is very clean aerodynamically. At 80-85 MPH the computer on my Camhead RT is mostly showing 50mpg depending on load. A friend with the Camhead GSA usually is showing 35-40-ish running with me at those speeds. A friend who rides a K1600GTL gets 45-50 mpg running similar speeds.
Last edited by ka5ysy; 11-09-2012 at 11:55 AM.
Doug, 2011 R1200RT Polar Metallic
MSF #127350 NAUI #36288