Supertrapp Se, PCIII Big Sucker on 08 RK

[jjr]

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

[jjr]

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.

Originally Posted by Dave63

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.