I install the Vince an Hines LCD fuel pack on my 2012 Fat Boy.
I have the Arlen Ness Big sucker and V-h Twin slash slip on muffler.
My fuel mileage has drop about 3-5 mile per gallon.
Has any body else ran in to the problem an is it fix able?

 

I get about 35mpg on mine and that's on a good day.
What were you expecting to get?

 

Fixable by going back to stock. You've modified intake & exhaust to suck more air & provided more fuel to avoid being too lean which equals lower gas mileage.

 

They come lean and get higher MPG, so you add a fueler, tell the engine to use more gas on each revolution and expect to get the same mileage. shake your head.
was said put it back to stock

 

Around town I'm at about 35mpg as well. Bike runs great!

 

Thanks for the info. I like the way the bike run so I will live with the lower fuel mileage. Don't want to go back to stock muffler are not loud enough.

 

I recently tuned mine as well using the FP3. I've noticed that my fuel mileage has dropped as well but the bike runs amazing.
Like 66cruiser and 1Canuck stated, our bikes come from the factory tuned lean. So with the bike pulling more air through the air cleaner and pushing more exhaust, it requires a little more fuel to run in the stoic air/fuel ratio mixture range.

 

I have a 14 Fatboy Lo and have been running FP3 with super radius pipes and upgraded AC since June. I just settled in to running a consistent map that I like and did a semi accurate mpg run 'cause I thought I'd lost quite a few mpg as well. I was pleasantly surprised to be getting 40.8 with a whole lot of mph law breaking to boot! I live in the country so I don't do much town driving though, mainly hills and twisties. Bike runs great by the way.