another fuel mileage thread........
Outstanding HDF Member
Joined: Sep 2005
Posts: 2,893
Likes: 2
From: USA
RE: another fuel mileage thread........
I have often wondered if a larger tank is available for my Ultra Road King. I don't care what the milage is, I just don't like to stop so often on the hi-way! 
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
RE: another fuel mileage thread........
Probably irrelevant among all these TC reports, but Old Blue's mileage varies greatly:
Worst, 75mph w/20mph headwind: 42 mpg
Usual around-town: 46-47
Usual 70-75mph constant, no wind: 45-48
Usual 55-60mph constant, no wind: 52-55
Best, 50-55mph w/20mph tailwind: 63
Average for road trips in touring trim: 54 (mostly backroads)
Thunderslide increased mileage 15% when installed in 1998, also improving throttle response and eliminating flat spot in previous setup with Yost Master Tube. I recommend this for bikes with CV carbs. Again, perhaps irrelevant since everyone here has EFI, but intesting by comparison.
Worst, 75mph w/20mph headwind: 42 mpg
Usual around-town: 46-47
Usual 70-75mph constant, no wind: 45-48
Usual 55-60mph constant, no wind: 52-55
Best, 50-55mph w/20mph tailwind: 63
Average for road trips in touring trim: 54 (mostly backroads)
Thunderslide increased mileage 15% when installed in 1998, also improving throttle response and eliminating flat spot in previous setup with Yost Master Tube. I recommend this for bikes with CV carbs. Again, perhaps irrelevant since everyone here has EFI, but intesting by comparison.
Outstanding HDF Member
Joined: May 2005
Posts: 3,116
Likes: 0
From: Glendale, AZ.
RE: another fuel mileage thread........
I have never gotten more then 37 to 38 MPG on my 06' FLHRI RK even with mostly highway riding at about 75 to 80 mph. Most of the time it's between 34 to 35 MPG with city and highway.
Cruiser
Joined: Sep 2006
Posts: 230
Likes: 0
RE: another fuel mileage thread........
07 RK Classic with the PCIII SE Air cleaner and has been Professionally Dyno-Tuned and I am at 30...this is mosty city type riding, very little interstate so far and I do tend to Play with the throttle a lil bit......LOL
Outstanding HDF Member
Joined: Apr 2006
Posts: 2,395
Likes: 25
From: St George, UT
RE: another fuel mileage thread........
Around here we have so many grades that just a quick ride to breakfast includes a couple of 6% grades. A 75 mph run up to Cedar City 45 miles away up a 6-8% grade takes almost a half a tank. Usually have a wind coming down the canyon too. If I were in the flatlands, no doubt I would have better fuel mileage.[8D]
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