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Discussion Starter #1
I'm looking to do the above mods to my 08 RK and was wondering if my mileage would go up or down. I plan to get everything from Fuel Moto.

I saw in the 08 specifications that the highway miles were supposed to be 54 mpg but as usuall I take that with a very large grain of salt. Just wondering what other 08 FLHR owners are getting mpg wise in stock or slightly modded versions.

TIA
John
 

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Discussion Starter #2
What if I just put mufflers on it, it should stay the same. FWIW i figured that the real world mileage on the 08 probably would be around 45mpg stock.

Mileage will go down. Harleys run lean from new. Adding a fatter map to make up for exhaust and air intake will actually drop your miles per gallon, but probably only down to the mid to high-40s.
 
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