On a 03 Heritage Springer FLSTSI with stock pipes I got aprox. 97 miles on 4 gallons of gas.
I put SE slip-ons and I got 87 miles to 4 gallons of gas
This bike is NEW it had 7 miles on it 1-1-8,I have riddenit approx. 300 milesand this last tank I went 103 miles on 3.9 gallons.
What if anything is wrong with this bike??
Will it get better??
Thanks
Radar

 

Seems a bit thirsty to me...if you look through threads it seems like most are in 42-47 mpg range...45-50 in 1200. I have never been able to ride hard enough to drop below 40 in Stage I FI Deuce....just sayin John

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Way low. As a Heritage Springer owner as well, and a complainer of poor mileage, I typically get 33 mpg(130 miles before reserve) on my '97, and average about 38 mpg on my '03. With my mileage, that would give you approximately 152 miles on 4 gallons. I would have it looked at.

 

sounds low get it checked out

 

I have an 04 heritage thats carb'd. I'm getting 43MPG 2 up. If your bike is carb'd I can tell you what I have done to get this milage.

 

Sorry, My bad, I didn't notice the FLSTSI. If I'm not mistaken the "I" indicates injected. This could be an expensive fix, not just a Saturday morning with 12 pack and a different size pilot jet.

 

I'd take it back and have that checked out!!
My FLHX got over 40mpg when it was completely stock!!

 

Does your fuel mileage go downhistorically when you modify your bike like putting a 98 inch kit in it.Or does it not effect fuel mileage.

 

yes' that sounds a little low

 

I have a 03 Duece that is fuelinjectedwith a stage 3 kit and hooker pipes.If I ride around 65 mph, I average between 40 and 45 mpg. At around 80 mph, I get about 30 mpg.