My 99 EG Standard (FLHT) with SE Air Cleaner, SE Performance II mufflers, SE 203 Cams, Larger Mikuni Carb would get high 40s and sometimes 50+ mpg on lazy country roads keeping it 55 and under and not wrist-happy. On the highway, over 70mph would drop to mid to high 30s.

My bone stock 08 FLHTC averages low to mid 40s across the board.

 

Hit reserve at 150 miles, stopped at 158 miles, put 4.6 gallons in it, 34 mpg, was going mostly 60 to 65 mph cruising easy, should be better.

 

Below are my experiences with my 07 Ultra.

Stock air Box, True duals stock ECM riding 2 up open road at 65MPH - 48 MPG

Stage 1 AC, True Duals PCV with 07 PCIII Map for my setup, 2-up open road 65MPH - 37 MPG

Stage 1 AC, True Duals PCV with 08 PCV MAP for my setup, 2-up open road 65MPH - 35 MPG

Stage 1 AC True Duals PCV loaded with exported 07 PCV autotune tweaked map from another bike, 2-up open road 65MPH -40MPG



Ken
Brandon, MS
07 Ultra Classic

 

2012 RKC 100% stock riding two up at 75mph I always average 41 mpg.

 

Those are almost exactly the same numbers I have with my 12 RK. 49.2 has been the max, so far.

 

2011 RKC 103 and Dynoed.
1 up City - 33. Mixed - 36. Highway - 41(70mph +)
2 up the numbers really don't change much.
I don't shift till 3000, and don't go into 6th gear till about 65mph.
Bike runs great.

 

stock and stage 1. 36 to 40 mpg

true duals,cams,103 with pump gas 93 octane. 32 to 36

adding octane boost has bumped it up noticeabley.

 

Stock 2011 road king classic and I average around 40 to 45 depending on type of driving. I have got 49 straight highway driving with cruise on.

 

Cannot really accurately compare later injected bikes with earlier carbed models in most cases. The Screamin Eagle insert came with the Screamin Eagle air cleaner kit, which was the filter and backing plate. A carburetor modification is something different and USUALLY was a Thunderslide kit, but not always. Sometimes nothing was done, other times jets were replaced or even drilled out. To tell if it has a Thunderslide kit, remove the air filter and look down the carb throat. If the slide is black plastic, then it has the Thunderslide kit. Those kits were pretty adjustable, including the metering rod length. If the plugs are pretty black it may be running too rich, also look at the muffler outlets if they are sooty black.

When I installed a Thunderslide kit in a 1200 Sportster I had years ago, the directions I followed as far as the jets and settings turned out too lean and I had to richen it a bit by lowering the metering rod clip a slot or 2. I would bet, if you do have the Thunderslide kit, the rod might need to be raised a slot and see how that works out. Raising the clip to a higher slot allows the rod to sink farther in the jet and leans it some. If I am remembering the directions right.

 

Thanks for the info, I will check tonight when I get home and yes the pipes are dark and a little sooty. I race cars in the SCCA, have a x Busch road race car and know how to tune a Holley carb, never messed with these before, the only issues running wise is after a long highway run, 20 miles or more the idle goes up about 300 rpm when coming to a light or stopping, then in stop and go traffic will settle down after a while to 900. It will set a 900 after warm up but again go up 300 after a long run, tried to adjust it but is to low after it settles down after a long run, not sure what to look for, am sure I need to get a manual to learn about these carbs.